| 单词 | magnetic needle |
| 例句 | After analyzing the field strength frozen in the tiny magnetic needles, they found that its intensity had already jumped to 70% of present values, they reported at the AGU meeting. Scientists are probing the secrets of Earth’s inner core—and how it saved life on our planet 2022-03-30T04:00:00Z The researchers looked at samples of plagioclase and clinopyroxene from eastern Quebec, Canada and found that they contain magnetic needles approximately 50 to 100 nanometers in size, surprising the researchers. Earth's magnetic field almost disappeared 565 million years ago 2019-01-30T05:00:00Z Finding the magnetoreceptors responsible for triggering these neurons has been like looking for a magnetic needle in a haystack. Maverick scientist thinks he has discovered a magnetic sixth sense in humans 2016-06-23T04:00:00Z On this as on the previous voyage, Hudson made some observations on the inclination or “dip” of the magnetic needle, and he is probably the first Englishman who had done so. The Sea: Its Stirring Story of Adventure, Peril, & Heroism. Volume 3 2012-04-03T02:00:31.900Z Faraday showed that a rotating disk of non-magnetic metal would draw after it in similar rotation a magnetic needle suspended over it, and even a heavy magnet. Mysterious Psychic Forces An Account of the Author's Investigations in Psychical Research, Together with Those of Other European Savants 2012-03-28T02:00:29.747Z Without inclination or dipping; Ð said the magnetic needle balances itself horizontally, having no dip. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The magnetic needle then makes known the presence of a current of electricity which has no appreciable effect upon any of man's five senses. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z So did the discovery of the magnetic needle and the new world. Sketches of Reforms and Reformers, of Great Britain and Ireland 2012-03-12T03:00:20.310Z As we have already mentioned, the variations of the magnetic needle have a period of the same length, its greatest variations occurring when there are most sun-spots. Meteorology or Weather Explained 2012-02-20T03:00:18.847Z No one knows why grass grows, why water runs, or why the magnetic needle points to the north. The Works of Robert G. Ingersoll, Vol. 11 (of 12) Dresden Edition?Miscellany 2012-02-11T03:03:52.627Z Unfavorable report on his petition for aid to enable him to make a voyage to Baffin's Bay to pursue his investigations of the causes of the variation of the magnetic needle. The Poems of Philip Freneau, Volume II (of III) 2012-01-10T03:00:15.980Z In this manner the magnetic needle, again, reveals to man the existence and presence of forces that he cannot sense directly. Joseph Smith as Scientist A Contribution to Mormon Philosophy 2012-03-12T03:00:27.817Z It has no effect even upon the electrometer or the magnetic needle; its force is radiating, quite independent of light, but considerably increased by heat. Modern Magic 2012-01-01T03:00:09.557Z A magnetic needle consists of a small bar magnet, supported upon a pivot or suspended so that it is free to turn in a horizontal or vertical plane. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Seeing how the master-mariner honours the magnetic needle, every thoughtful passenger will probably consult it in like manner. Ancient Faiths And Modern A Dissertation upon Worships, Legends and Divinities 2011-11-24T03:00:37.917Z With the magnetic needle they began to sail farther away from the shores, and since then they have discovered many new seas. Fables for Children, Stories for Children, Natural Science Stories, Popular Education, Decembrists, Moral Tales 2011-11-17T03:00:35.327Z But still there survives within the American breast a popular sentiment, which, like the magnetic needle, ever points to an unerring polar star. Nature and Culture 2011-11-17T03:00:34.107Z Persons magnetized by the mysterious force of the baquet have, however, an astonishing power over the magnetic needle and can make it deflect by motion, fixed glance, or even mere volition. Modern Magic 2012-01-01T03:00:09.557Z The form of magnetic needle illustrated in fig. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Such wandering gives rise to variations in the direction of the magnetic needle from year to year. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z When the electric shock is very strong, it will give polarity to magnetic needles, and sometimes it reverses their poles. Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry 2011-10-11T02:01:05.817Z He was using a magnetic compass, which is a small magnetic needle balanced on a steel point. The Story of Great Inventions 2011-10-05T02:00:16.353Z Messages were interrupted, for the storm took possession of the wires and sent messages of its own, the magnetic needles darting to and fro as though seized with madness. Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science 2011-10-03T02:00:33.003Z If a small magnetic needle, suspended by a thread, be held near a magnet, it will point in some fixed direction depending on the proximity of the poles of the magnet. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z In 1632 Galileo referred to a secret art of communicating at great distances by means of magnetic needles. Great Inventions and Discoveries 2011-10-01T02:00:30.900Z The former is called the variation, and the latter the dipping of the magnetic needle. Heads of Lectures on a Course of Experimental Philosophy: Particularly Including Chemistry 2011-10-11T02:01:05.817Z An electrical machine or a battery of Leyden jars can be made to give out an electric current, and this current will affect a magnetic needle in the same way that a battery current will. The Story of Great Inventions 2011-10-05T02:00:16.353Z To turn to one idea or to one feeling, as a magnetic needle turns to the north, is not within their power nor their concern. Whirlpools A Novel of Modern Poland 2011-09-16T02:00:19.893Z At the centre of the coils is suspended a small magnetic needle the length of which should not be greater than 1⁄10 the radius of either coil. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z A current of electricity was passed through a long wire, and set a magnetic needle at the end quivering under its influence. Triumphs of Invention and Discovery in Art and Science 2011-07-19T02:00:21.280Z We succeed in doing this because these electrons in the magnetic needle are on the move also. Autobiography of an Electron Wherein the Scientific Ideas of the Present Time Are Explained in an Interesting and Novel Fashion 2011-06-19T02:00:25.633Z When Oersted's discovery was made known men began to think of signalling to a distance by means of the action of an electric current on a magnetic needle. The Story of Great Inventions 2011-10-05T02:00:16.353Z A bent wire, carrying a small magnetic needle, is balanced on the steel point, so that the magnet, with the fine wire, arranges itself horizontally in the direction of the magnetic meridian. A Treatise on Meteorological Instruments Explanatory of Their Scientific Principles, Method of Construction, and Practical Utility 2011-06-19T02:00:15.717Z In its simple and original form the movable needle galvanometer consisted of a horizontal magnetic needle suspended within a coil of insulated wire by silk fibres or pivoted on a point like a compass needle. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z When a magnetic needle is balanced on a point, it remains at rest in one position only, pointing then nearly due north and south. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z If a magnetic needle is brought near a conductor carrying a current, it will be found to be deflected. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z A current may be sent over a very long wire, and it will deflect a magnetic needle at the other end. The Story of Great Inventions 2011-10-05T02:00:16.353Z But it could hardly come into general employment till men reached beyond the mediæval stage of a magnetic needle enclosed in a tube so as to float on water. The Chronicle of the Discovery and Conquest of Guinea Vol. II 2011-04-05T02:00:10.813Z Alternating Current Galvanometers.—For the detection of small alternating currents a magnetic needle or movable coil galvanometer is of no utility. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Dialling, the art, of making sundials; also the art and practice of mine-surveying, in which the theodolite and magnetic needle are employed. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z They glided past over the black water, a broad stream of humanity attracted as by a magnetic needle, lured by a voice. Countess Erika's Apprenticeship 2011-03-10T03:00:46.973Z Oersted of Copenhagen found that the position of the magnetic needle may be changed by the electric current, and that a magnet will induce electricity in a coil of wire. Famous Men of Science 2011-03-08T03:00:49.717Z He studied heat, light, sound, colour, pneumatics, the magnetic needle. A Short History of Italy (476-1900) 2011-02-24T03:01:00.630Z The mirror was made of silvered microscopic glass about � in. in diameter, and the magnetic needle or needles consisted of short fragments of watchspring cemented to its back. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z In the third, the magnetic needle was discovered, the written characters improved, civilized life advanced, and a great revolt suppressed. A Manual of the Antiquity of Man 2011-02-21T03:00:07.080Z Moreover, he found that a magnetic needle hung near the tube was deflected as if held near an electric current. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Yet his vitality is not superficial; it is inwardly prompted, and as sensitive and quick as a magnetic needle. Character and Opinion in the United States 2010-12-20T17:12:15.253Z The common magnetic needle points nearly north and south; and if a bit of iron be brought near to either end of the needle, they will mutually attract each other. The Glaciers of the Alps Being a narrative of excursions and ascents, etc. Here he worked away indefatigably at his observations day after day, watching the often mysterious movements of the magnetic needle, which would sometimes give him no end of trouble. Farthest North Being the Record of a Voyage of Exploration of the Ship 'Fram' 1893-1896 I also succeeded in making a compass of a rough description by fixing a dial to some magnetic needles and suspending it with a thread. A Kut Prisoner A thin magnetic needle is held in a light, paper sling at F, suspended by a fine, vertical fiber. The Earliest Electromagnetic Instruments This work contains an account of Norman's discovery of the Dip of the magnetic needle, and of his investigation of it by means of the Dipping-needle, which he invented. On the magnet, magnetick bodies also, and on the great magnet the earth a new physiology, demonstrated by many arguments & experiments I secured a number of fragments, which I still possess, and which act forcibly upon a magnetic needle. The Glaciers of the Alps Being a narrative of excursions and ascents, etc. Inclination of magnetic needle probably connected with, II, 19. Farthest North Being the Record of a Voyage of Exploration of the Ship 'Fram' 1893-1896 At noon a meridian observation was obtained, which placed the mouth of Refuge Cove in latitude 69° 29' N.; and the sun's bearing showed the variation of the magnetic needle to be 49½° easterly. Narrative of a Second Expedition to the Shores of the Polar Sea These clouds sometimes range themselves, even by day, in a similar manner to the beams of the aurora, and then disturb the course of the magnetic needle in the same manner as the latter. The Philosophy of the Weather And a Guide to Its Changes The laws of the motion of the magnetic needle when acted upon by a current of electricity traversing a wire were successfully investigated by M. Ampère of the French Academy. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action When the variations of the magnetic needle were noticed by the voyagers, they decided that it was not the needle but the north star that varied. The Spanish Pioneers This was with no intention of helping explorations toward the North Pole, but to permit the study of weather phenomena and the actions of the magnetic needle, respecting which much remains to be learned. The Greater Republic A History of the United States The magnetic needle also evinced some curious disturbance, the dip being invariably upward. Caxton's Book: A Collection of Essays, Poems, Tales, and Sketches. The magnetic needle moves to the west in summer, from about 8 A.M. till about 2 P.M., and the extent of its progress, during that period, constitutes the magnitude of its daily variation. The Philosophy of the Weather And a Guide to Its Changes A freely suspended magnetic needle will not maintain a horizontal position except at the magnetic equator. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" On the outside of the frame, place a small pin, which serves to show when the magnetic needle is to stop. Endless Amusement A Collection of Nearly 400 Entertaining Experiments In September, to the amazement of all on board, the compass was seen to "vary": an important scientific discovery—viz., that the magnetic needle does not always point to the pole-star. The Story of Extinct Civilizations of the West Throw away," says Savage, "prejudice and conceit, seek to make your conscience like the magnetic needle. Was Man Created? All currents of electricity have encircling currents of magnetism, and all deflect the magnetic needle. The Philosophy of the Weather And a Guide to Its Changes Thus, for many years the fact that a magnetic needle pointed toward the North was a mere unexplained fact, but later the reason was discovered. How to Study It is, or seems to be, a consciousness of direction that is as unerring as the magnetic needle. Ways of Nature Suppose we have a line of magnetic needles free to turn, hundreds or thousands of them, but disarranged. The Machinery of the Universe Mechanical Conceptions of Physical Phenomena No experiment appears, however, to have been made to determine the question until 1820, when Oersted placed a magnetic needle within the influence of a wire connecting the extremities with a voltaic battery. The International Monthly, Volume 3, No. 2, May, 1851 It is illustrated by figure 1, in which the magnetic needle is deflected by the action of a current of galvanism transmitted through the wire A B. Fig. Little Masterpieces of Science: Invention and Discovery Instrument composed of one or more magnetic needles attached to a circular card which turns freely on the point of a steel cone or floats on a liquid. Boys' Book of Model Boats Variation is a partial change in form, qualities, etc., but especially in position or action; as, the variation of the magnetic needle or of the pulse. English Synonyms and Antonyms With Notes on the Correct Use of Prepositions The Chinese, however, do not seem to have adopted their small needle from any knowledge either of the variation, or of the inclination of the magnetic needle. Travels in China, Containing Descriptions, Observations, and Comparisons, Made and Collected in the Course of a Short Residence at the Imperial Palace of Yuen-Min-Yuen, and on a Subsequent Journey through the Country from Pekin to Canton The voltaic current was now, for the first time, observed to produce a deviation of the magnetic needle in different directions, and in different degrees, according to the relative situation of the wire and needle. The International Monthly, Volume 3, No. 2, May, 1851 The magnetic needles in our observatories are, for instance, seen to oscillate violently, telegraphic communication is for a while upset, and magnificent displays of the aurora borealis illumine our night skies. Astronomy of To-day A Popular Introduction in Non-Technical Language It is to this conduct on the part of a magnetic needle when in a "magnetic field" that we owe the existence of the needle telegraph instrument. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use You should not use iron nails or screws in the construction of electrical apparatus, when a magnetic needle is to be used in connection with it, as these would attract the needle. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity It has been conjectured, indeed, that the use of the magnetic needle, in Europe, was first brought from China by the famous traveller Marco Polo the Venetian. Travels in China, Containing Descriptions, Observations, and Comparisons, Made and Collected in the Course of a Short Residence at the Imperial Palace of Yuen-Min-Yuen, and on a Subsequent Journey through the Country from Pekin to Canton Experimental work on the use of the magnetic needle on copper deposits has yielded some interesting and suggestive results, but this investigation is still under way and the results have not been published. The Economic Aspect of Geology Wheatstone and Cooke invented the magnetic needle telegraph. A History of the Nineteenth Century, Year by Year Volume Two (of Three) Needle instruments—Influence of current on the magnetic needle—Method of reversing the current—Sounding instruments—Telegraphic relays—Recording telegraphs—High-speed telegraphy. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use It is an advantage to have a magnetic needle that is always ready for use. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity Humboldt says that the regularity of the hourly variations of the magnetic needle and the atmospheric pressure is undisturbed on earthquake days within the tropics. Travels in Peru, on the Coast, in the Sierra, Across the Cordilleras and the Andes, into the Primeval Forests Draw a meridian on the sheet parallel to the position of the magnetic needle. Manual of Military Training Second, Revised Edition The situation of this place between the terrestrial and magnetic equators was most favourable for conducting observations on the variations of the magnetic needle. Celebrated Travels and Travellers Part III. The Great Explorers of the Nineteenth Century The magnetic needle was apparently describing a semicircle. The Submarine Hunters A Story of the Naval Patrol Work in the Great War The magnetic needle is supported by a sewing-needle stuck through a cork. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The day proving calm, we employed it in swinging the Hecla, in order to obtain the amount of the deviation of the magnetic needle, and to fix afresh the iron plate for correcting it. Journal of the Third Voyage for the Discovery of a North-West Passage The earth causes the fall of heavy bodies, and it also, in its capacity of an immense magnet, causes the phenomena of the magnetic needle. A System Of Logic, Ratiocinative And Inductive (Vol. 1 of 2) The Russian explorer noticed, as La P�rouse had done before him, that the deviation of the magnetic needle is but little noticeable in these latitudes. Celebrated Travels and Travellers Part III. The Great Explorers of the Nineteenth Century This tendency to overestimate distances is almost universal among explorers who set the first distances, and it ought to be reckoned as a factor of error, like the dip of the magnetic needle. The Young Alaskans on the Missouri The conducting wire has a magnetic field while the current passes through it, and this gives the wire the power to act upon a magnetic needle just as another magnet would. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The latitude of our landing-place was 73° 27′ 23″, the longitude by chronometers 90° 50′ 34.6″, and the variation of the magnetic needle 125° 34′ 42″ westerly. Journal of the Third Voyage for the Discovery of a North-West Passage A term applied to the deviation of the magnetic needle or compass, from the true north point towards either east or west; called also the declination. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. When once the different phenomena of the variations of the magnetic needle, either of declination or inclination, should be fully understood, it would be easy; but how to obtain this knowledge? Celebrated Travels and Travellers Part 2. The Great Navigators of the Eighteenth Century They got back to the laboratory in order to examine the magnetic needles. Bouvard and Pécuchet A Tragi-comic Novel of Bourgeois Life The ordinary magnetic needle points to the north quite strongly. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity These clouds sometimes range themselves even by day in a similar manner to the beams of the aurora and then disturb the course of the magnetic needle in the same manner as the latter. New and Original Theories of the Great Physical Forces The inclination of the magnetic needle towards the earth. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. His immense discoveries, his cosmographical works, his study of the variations of the magnetic needle, his wisdom, his humane disposition, and his honourable conduct, place Sebastian Cabot in the foremost rank among discoverers. Celebrated Travels and Travellers Part I. The Exploration of the World All travellers have vouched for its existence, and at the Palais Royal M. Dupotet moves with his finger the magnetic needle. Bouvard and Pécuchet A Tragi-comic Novel of Bourgeois Life You should remember that no action will take place unless the magnetic field around the magnetic needle is acted upon by that around the coil. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The parallel case to that of electric currents is given by placing two magnetic needles side by side with like poles in the same direction.” Aether and Gravitation Like the Voltaic current, the thermo-electric current can heat wires, produce decomposition, magnetise iron, and deflect a magnetic needle at any distance from its origin. Fragments of science, V. 1-2 The proof is contained in the remarkable fact, that the iron interposed between the magnet and the magnetic needle breadthways constantly acquires its two opposite poles at both ends lengthways. Hints towards the formation of a more comprehensive theory of life. Bismuth and antimony also are inactive, whilst almost all minerals containing even a small percentage of iron will deflect the magnetic needle, at least under the influence of heat. The Chemistry, Properties and Tests of Precious Stones In the magnetic needles so far described, the pointing-power has been quite strong. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity It is necessary to chart the variations of the magnetic needle for the use of the navigator. Wealth of the World's Waste Places and Oceania You may reply, that many of the inferences of science are of this character — the inference, for example, that an electric current, of a given direction, will deflect a magnetic needle in a definite way. Fragments of science, V. 1-2 An instrument for measuring static electricity, differing from a galvanometer, which measures a current in a wire that acts on the magnetic needle p. 197of the galvanometer. Electricity for Boys This point is noted for the singular agitation of the magnetic needle. Old Mackinaw The Fortress of the Lakes and its Surroundings In this way the strength of the magnetic field about the coil can be regulated, and its effect upon the magnetic needle, M, changed. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity A parent might just as well decide that the magnetic needle will point to Venus or Jupiter without trying it, as to decide what profession his son shall adopt. Pushing to the Front Why, we enquire, does the magnetic needle set north and south? Fragments of science, V. 1-2 The south pole of a magnetic needle is attracted so it points to the north magnetic pole; and the north pole of the needle is attracted to point to the south magnetic pole. Electricity for Boys Among other projects, with which we begin to abound in America, is one for finding the latitude by the variation of the magnetic needle. The Writings of Thomas Jefferson Library Edition - Vol. 6 (of 20) The combination, thus, of a coil of wire and a magnetic needle, properly arranged, makes an instrument with which the presence of electricity can be detected. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The magnetic needle does not point to all the lights in the heavens to see which it likes best. Pushing to the Front And substituting, as before, a bit of iron wire for the magnetic needle, the positions of both will be the same. Fragments of science, V. 1-2 The change of movement of a magnetic needle out of its regular direction of movement. Electricity for Boys Besides, Paul knew how to make a compass out of his watch, though he generally carried a real magnetic needle in his pocket for emergencies. The Banner Boy Scouts on a Tour, or, The Mystery of Rattlesnake Mountain A magnetized sewing-needle will do, and this will keep the magnetic needle quiet and parallel to it when the current is not passing through the coil. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The Chinese were acquainted with the magnetic needle 1100 years before Christ, and made compasses, and they knew of gunpowder long before Europeans. From Pole to Pole A Book for Young People The direction of the magnetic needle in London, which is called the magnetic meridian, encloses an angle of 24° with the astronomical meridian, this angle being called the Declination of the needle for London. Fragments of science, V. 1-2 But Sweetbriar evidently had a better brain than usual, for when the whirl came to an end, it always found his pointing like the magnetic needle to the north. Dulcibel A Tale of Old Salem It is added, that the girl produced no effect on the magnetic needle. The Atlantic Monthly, Volume 14, No. 83, September, 1864 Of course, it takes a little more current to move the magnetic needle when the bar magnet is in place, than it does without the magnet. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity These poles attract and repel the corresponding poles of a magnetic needle, just as another large needle would. Left on Labrador or, The cruise of the Schooner-yacht 'Curlew.' as Recorded by 'Wash.' Mark the experiment: When the knob is uppermost, it attracts the north end of a magnetic needle; when undermost it attracts the south end of a magnetic needle. Fragments of science, V. 1-2 He found that she was as obedient to her helm under water, as any boat could be on the surface, and that the magnetic needle traversed as well in the one as in the other. Hidden Treasures Or, Why Some Succeed While Others Fail I attached the car and put all my implements in it—a telescope, a barometer, a thermometer, an velectrometer, a compass, a magnetic needle, a seconds watch, a bell, and other things. The Literary World Seventh Reader In order, however, to determine the direction of currents by means of a magnetic needle, study the effect with a single turn of wire at first. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity So regular is the oscillation, as likewise the variations of the magnetic needle, that the hour may be known within fifteen minutes by the barometer or compass. The Andes and the Amazon Across the Continent of South America Substitute for your magnetic needle a bit of iron wire, devoid of permanent magnetism, and it will set itself exactly as the needle does. Fragments of science, V. 1-2 A peculiar phenomenon accompanying this seismic disturbance was the variation of the magnetic needle by over eighty degrees from north to east and an extraordinary rise and fall of the barometer. The Man Who Rocked the Earth N.; longitude 3° 17' 55" W.; variation 27° 50' W.; dip of the magnetic needle, 74° 33' 20". Narrative of a Journey to the Shores of the Polar Sea, in the Years 1819-20-21-22, Volume 1 It supports the magnetic needle which is inside of E. E is the outside of a glass-covered compass. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity These horary variations of the magnetic needle are as great at the bottom of deep mines far removed from solar influence, as on the surface. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence When the neutralisation is perfect, the magnetic needle connected with the pile is no longer deflected, but points to the zero of the graduated circle over which it hangs. Fragments of science, V. 1-2 "Tell Paris that we had earthquake shocks here together with violent seismic movements, sudden rise in barometer, followed by fall, statics, and erratic variation in the magnetic needle." The Man Who Rocked the Earth Nothing worthy of remark occurred during this passage, except the rapid decrease in the variation of the magnetic needle. Narrative of a Journey to the Shores of the Polar Sea, in the Years 1819-20-21-22, Volume 1 When a wire carrying a current of sufficient strength is properly brought near a magnetic needle, the latter will be deflected from its N and S line. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity But there are also irregular fluctuations in the direction of the magnetic needle. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence This current conducted round a magnetic needle deflects it, and the magnitude of the deflection is a measure of the heat falling upon the pile. Fragments of science, V. 1-2 Dry as dust, sapless as steel, precise as the magnetic needle, he had hitherto been to me the mummified embodiment of science militant. In Search of the Unknown About half a mile from the bend or knee of the lake, there is a small rocky islet, composed of magnetic iron ore, which affects the magnetic needle at a considerable distance. Narrative of a Journey to the Shores of the Polar Sea, in the Years 1819-20-21-22, Volume 1 An electric current meter may be made by giving inclination to the disk, which is for this purpose made exceedingly small and delicate, by means of a heavy magnetic needle deflected by the current. Scientific American Supplement, No. 315, January 14, 1882 Another fact is the disturbance of the magnetic needle during a storm. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence While some vapours allow the Naves a comparatively free passage, the faintest mixture of other vapours causes a deflection of the magnetic needle. Fragments of science, V. 1-2 And they couldn't help it because there was a man in that chapel who drew them as surely as the North Pole draws the magnetic needle. Boy Woodburn A Story of the Sussex Downs They will hardly believe an unseen force flows through the magnetic needle, turning it to the north. The Golden Censer The duties of to-day, the hopes of the future During that year Oersted discovered that an electric current would deflect a magnetic needle, thus showing that there was some relationship between electric and magnetic force. Scientific American Supplement, No. 717, September 28, 1889 Among other projects, with which we begin to abound in America, is one for finding the longitude by the variation of the magnetic needle. Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson, Volume 2 A thermoelectric pile, entirely screened from the hot ball, was exposed to the radiation of the warm gas, while the deflection of a magnetic needle connected with the pile declared the energy of the radiation. Fragments of science, V. 1-2 Barlow could not word all these things; subconsciously they swayed him—like the magnetic needle, always toward the pole of right. Caste A magnetic needle held under a current-bearing wire turns on its pivot and finally comes to rest at an angle with the current. General Science The direction, dip, and variations of the magnetic needle, are facts half terrestrial, half celestial—are caused by earthly forces which have cycles of change corresponding with astronomical periods. Essays on Education and Kindred Subjects Everyman's Library We were advancing towards the south; the magnetic needle pointed in the direction of Frankfort, which was flying beneath our feet. A Voyage in a Balloon (1852) We can do with the body all that we have already done with the battery — heat platinum wires, decompose water, magnetise iron, and deflect a magnetic needle. Fragments of science, V. 1-2 And in Barlow was the something of breeding that held him to the true thing, to the pole; the breeding might be compared to the elusive thing in the magnetic needle. Caste The human eye has within it all the power of attraction possessed by a magnetic needle. His Excellency the Minister The space, around a wire carrying an electric current, or in the neighborhood of a magnet, has a directive effect upon a magnetic needle, and is hence called a magnetic field. Notable Events of the Nineteenth Century Great Deeds of Men and Nations and the Progress of the World To these are subjoined the mean variation of the compass, the dip of the magnetic needle, and a table of the latitude and longitude of the Sandwich Islands. A General History and Collection of Voyages and Travels, Volume 17 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time I hold a magnetised strip of steel by its centre, and find that one half of the strip attracts, and the other half repels, the north end of a magnetic needle. Fragments of science, V. 1-2 You wouldn't know where you were; and when you came to; you'd own about fifty gold-mines, with all the dips, spurs, and angles, and all the variations of the magnetic needle to wit and aforesaid. Heart's Desire A compound magnetic needle was used to detect the currents. Experimental Researches in Electricity, Volume 1 These clouds sometimes range themselves, even by day in a similar manner to the beams of the Aurora, and then disturb the course of the magnetic needle in the same manner as the latter. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 On the 31st, being in latitude 12� 48' S., longitude 15� 40' W., the magnetic needle was found to have no dip. A General History and Collection of Voyages and Travels, Volume 17 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time We were here in latitude, by account, 81° 23", and in longitude, by the chronometers, 21° 32' 34" E., in which situation the variation of the magnetic needle was observed to be 15° 31' westerly. Three Voyages for the Discovery of a Northwest Passage from the Atlantic to the Pacific, and Narrative of an Attempt to Reach the North Pole, Volume 2 Hence the discovery of the Page 65 polar tendency of the magnetic needle was a necessary prelude to any extended voyages away from land. The Story of Geographical Discovery How the World Became Known This expectation was fulfilled by revolving the ball beneath the magnetic needle, the latter being still inclosed in its jar. Experimental Researches in Electricity, Volume 1 The mysterious course of the magnetic needle is equally affected by time and space, by the sun's course, and by changes of place on the Earth's surface. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Dip of the south end of the magnetic needle 26 3 Variation of the compass 1 0 west. A General History and Collection of Voyages and Travels, Volume 17 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time Such direction is, by definition, and conventionally, that in which the north pole of a small magnetic needle, free to move in the field, would travel. Scientific American Supplement, No. 470, January 3, 1885 Placing such a magnet upright upon a table, and bringing a magnetic needle near its bottom, one end of the needle is observed to retreat from the magnet, while the other as promptly approaches. Six Lectures on Light Delivered In The United States In 1872-1873 The galvanometer which I had occasion to use was rough in its construction, having but one magnetic needle, and not at all delicate in its indications. Experimental Researches in Electricity, Volume 1 Richardson, magnetic phenomena attending the Aurora, 197; whether accompanied by sound 200; influence on the magnetic needle of the Aurora, 201. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Dip of the south pole of the magnetic needle 28 15 0 Variation of the compass 0 54 0 west. A General History and Collection of Voyages and Travels, Volume 17 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time Nothing worthy of remark occurred during this passage except the rapid decrease in the variation of the magnetic needle. The Journey to the Polar Sea Thus about fifty years ago Œrsted, of Copenhagen, discovered the deflection of a magnetic needle by an electric current; and about the same time Thomas Seebeck, of Berlin, discovered thermoelectricity. Six Lectures on Light Delivered In The United States In 1872-1873 Hence it would appear that if the same absolute quantity of electricity pass through the galvanometer, whatever may be its intensity, the deflecting force upon the magnetic needle is the same. Experimental Researches in Electricity, Volume 1 Long before the times of Gilbert and Hooke, it was taught in the Chinese work 'Ow-thea-tsou' that heat diminished the directive force of the magnetic needle. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Over this dial is a magnetic needle or pointer, 6 in. long, perfectly balanced on the end of a standard and above all is placed a cover having a glass top. The Boy Mechanic: Volume 1 700 Things for Boys to Do About half a mile from the bend, or knee, of the lake there is a small rocky islet composed of magnetic iron ore which affects the magnetic needle at a considerable distance. The Journey to the Polar Sea Placing a small magnetic needle near a bar magnet, it takes a determinate position. Six Lectures on Light Delivered In The United States In 1872-1873 Dr. Ritchie has shown that in a case where the intensity of the electricity remained the same, the deflection of the magnetic needle was directly as the quantity of electricity passed through the galvanometer67. Experimental Researches in Electricity, Volume 1 Disturbance of the regular course of the magnetic needle. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 It is true that he was always one-sided, but one-sided like the magnetic needle, which always points to the north, and never once veers to south or west. The German Classics of the Nineteenth and Twentieth Centuries, Volume 06 Masterpieces of German Literature Translated into English. in Twenty Volumes On the 10th the dip of the magnetic needle, being observed, showed a decrease of 22 minutes 44 seconds since last autumn. The Journey to the Polar Sea A needle of iron will answer as well as the magnetic needle; for the needle of iron is magnetized by the magnet, and acts exactly like a steel needle independently magnetized. Six Lectures on Light Delivered In The United States In 1872-1873 The particles of an insulating dielectric whilst under induction may be compared to a series of small magnetic needles, or more correctly still to a series of small insulated conductors. Experimental Researches in Electricity, Volume 1 One hundred and ninety-two observations have been made for determining the variation of the magnetic needle at three important points. A Compilation of the Messages and Papers of the Presidents Volume 4, part 2: John Tyler The —— of the properties of the magnetic needle is said to have been made by the Chinese; also, the —— of gunpowder. Practical Exercises in English In this telegraph a magnetic needle was located within a loop formed by the telegraph circuit at the receiving end. Masters of Space Morse, Thompson, Bell, Marconi, Carty The magnetic needle had been deviated, and instead of marking the magnetic north, which differs a little from the north of the world, it marked the northeast. Dick Sand A Captain at Fifteen In the first place, you may not know that one of the objects of the Arctic expeditions was to discover "the intensity of the magnetic needle." The Life and Letters of Lewis Carroll (Rev. C. L. Dodgson) The errors from the tracing telegraph are less than those from the magnetic needle; but the difference is very trifling. Lands of the Slave and the Free Cuba, the United States, and Canada I made no use of the deflections of the magnetic needle as signs. Samuel F. B. Morse, His Letters and Journals In Two Volumes, Volume II The possibility of using the deflection of a magnetic needle by an electric current passing through a wire as a means of conveying intelligence was quickly grasped by those who were striving for a telegraph. Masters of Space Morse, Thompson, Bell, Marconi, Carty Was it, then, Negoro's interest for the magnetic needle to return to its true direction? Dick Sand A Captain at Fifteen It consisted of three magnetic needles surrounded by multiplying coils, and actuated by three separate circuits of six wires. Heroes of the Telegraph After having finished his observations, which referred chiefly to the magnetic needle, with all the tranquillity of a doctor in his study, Gay-Lussac descended to the earth between Rouen and Dieppe, eighty leagues from Paris. Wonderful Balloon Ascents Their mode of indicating signs for communicating intelligence was by deflecting five magnetic needles in various directions, in such a way as to point to the required letters upon a diamond-shaped dial-plate. Samuel F. B. Morse, His Letters and Journals In Two Volumes, Volume II In England, Wheatstone and Cooke had introduced a ponderous magnetic needle telegraph. Edison, His Life and Inventions If it be true that the iron masses were thus imbedded, like plums in an astral pudding, the hypothetic buried star might have great size and yet only small power to attract the magnetic needle. Arizona Sketches They are universal on both sides of the globe; and from pole to pole the magnetic needle trembles during their continuance. Men of Invention and Industry It has two or more magnetic needles permanently attached to a card, which moves freely upon a pivot, and is read with reference to a mark on the box representing the ship's head. The Gutenberg Webster's Unabridged Dictionary Section C A red ferruginous crust projected from the highest part, and, on this summit, the magnetic needle was greatly affected by local attraction, and quite useless. Journal of an Expedition into the Interior of Tropical Australia The only instrument we used was the special magnetic needle. Edison, His Life and Inventions Now that the wind had shifted to the south-west, it suited his machinations that the magnetic needle should indicate its true direction. Dick Sands, the Boy Captain The tube within which the magnetic needle swings is inserted into the stand, which is bored out to the external diameter of the tube. Scientific American Supplement, No. 433, April 19, 1884 The magnetic needle began to vary its direction. The Columbiad The discovery of the magnetic needle was a boon to mankind, and has been of inestimable service in guiding the mariner through trackless waters, and the explorer over desert wastes. Scientific American Supplement, No. 360, November 25, 1882 Our magnetic needle indicated the presence and richness of the invisible deposits of magnetic ore. Edison, His Life and Inventions Cook was assiduous in obtaining observations to ascertain the Variation of the compass--i.e., the difference between the direction shown by the magnetic needle and the true north. Captain Cook's Journal During the First Voyage Round the World It was on Christmas morning, 1821, that Faraday first succeeded in making a magnetic needle rotate around a wire carrying an electric current. Steam, Steel and Electricity But save for a few social events, and for some valuable experiments with the magnetic needle, to be referred to in the final chapter, his time and energies were absorbed by work upon his charts. The Life of Captain Matthew Flinders This supposed influence of tobacco on animal electricity is as general on the continent of South America, as the belief among mariners of the effect of garlic and tallow on the magnetic needle. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 Another special instrument is a "dead beat" galvanometer which differs from the ordinary form of galvanometer in having no coils or magnetic needle. Edison, His Life and Inventions I anxiously awaited that extraordinary agitation of the magnetic needle which announces the existence of an Aurora Borealis in Northern Europe. The World's Greatest Books — Volume 04 — Fiction These lines of magnetic force act on magnetic needles like other lines of magnetic force and tend to set movable magnetic needles at right angles to the conducting wire. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents At the place where the magnetic meridians cross, the only phenomenon produced is the vertical position of the magnetic needle in two similar points of the terrestrial globe. An Antarctic Mystery He could no more vary from his course than a magnetic needle can vary from its pole. Bull Hunter Having determined to investigate the mountain regions of New Jersey, I constructed a very sensitive magnetic needle, which would dip toward the earth if brought over any considerable body of magnetic iron ore. Edison, His Life and Inventions He also invented a telegraphic arrangement in which he used the magnetic needle and coil and the galvanic battery. The Great Events by Famous Historians, Volume 17 Together with the magnetic needle, which originated in China, it led to centuries of effort to open a way by sea to that far-off fairyland. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents It is made untrue in an instant, as the magnetic needle of a ship is deflected when it passes near great mountains of iron ore. The Majesty of Calmness; individual problems and posibilities They also make use of a compass marked north and south; that is, so that the point of the magnetic needle is directly on the fleur de lis. Voyages of Samuel De Champlain — Volume 03 I took the altitude, and found the latitude 42°, and the deflection of the magnetic needle 18° 40'. Voyages of Samuel De Champlain — Volume 02 The Esquimaux are not acquainted with the qualities of the magnetic needle, and, it is needless to say, do not travel by the compass. Schwatka's Search To this day the magnetic needle in China continues to be called by a name which means that it points to the south. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents If we charge a wire with an electric current and place a magnetic needle near it we find it moves the needle from one position to another. Marvels of Modern Science It is, They therefore, very necessary to know the meridian, and the declination of the magnetic needle, for this knowledge can serve all navigators. Voyages of Samuel De Champlain — Volume 03 In the first place, there are at its entrance several islands distant ten or twelve leagues from the main land, which are in latitude 44°, and 18° 40' of the deflection of the magnetic needle. Voyages of Samuel De Champlain — Volume 02 That night, after following the magnetic needle towards the south-east, we were fairly on the plateau at one hundred and forty miles, with an altitude of four thousand four hundred feet. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 The route will lead towards the Magnetic Pole, and the determination of the dip of the magnetic needle will be of importance in practical magnetism. South: the story of Shackleton's 1914-1917 expedition It became practicable, however, when Oersted discovered that a magnetic needle could be swung to one side or the other by an electric current passing near it. The Story of Electricity At one period the declination of the magnetic needle was supposed to furnish the means of a practical solution. Voyages of Samuel De Champlain — Volume 03 The magnetic needle was employed in navigation as early as the year 1200, and its variation had been discovered before the time of Columbus. Voyages of Samuel De Champlain — Volume 02 Before moving off, Webb found that the magnetic needle had "waltzed" back 60 degrees since the one-hundred-mile camp, now pointing 80 degrees east of south. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 The latter has curious magnetic properties; a magnetic needle brought alongside of it will be found placing itself at right angles to the wire bearing the current. Side-Lights on Astronomy and Kindred Fields of Popular Science Here we seem to have a reference to the magnetic cup used in night sailing; and this is another proof that the use of the magnetic needle in sea-voyages was associated with the Atlantean gods. Atlantis : the antediluvian world Armed with his hammer, his steel pointer, his magnetic needles, his blowpipe, and his bottle of nitric acid, he was a powerful man of science. A Journey to the Interior of the Earth The variation of the magnetic needle in 1871, fifteen miles South of the Harbor of Canseau, was, according to the Admiralty charts, 23 degrees west. Voyages of Samuel De Champlain — Volume 02 Under these conditions it is obvious that the magnetic needle is quite useless for steering purposes. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 The thousands of tons of iron in a ship must exert a strong attraction on the magnetic needle. Side-Lights on Astronomy and Kindred Fields of Popular Science The carriage of her head—motion within motion—a glide upon a glide—was as delicate as that of a magnetic needle. Desperate Remedies No magnetic needle was ever truer than his finger when he touched the vulnerable spot in an opponent's mind. Democracy, an American novel A mind of this sort we may compare to a magnetic needle, the poles of which have been suddenly reversed by a flash of lightning, or other more obscure accident of nature. Confessions of an Inquiring Spirit and Some Miscellaneous Pieces The lamp is the source of the light, projected on to small mirrors attached to the magnetic needles of three variometers. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 Historical evidence of the use of the magnetic needle in navigation dates from the twelfth century. Side-Lights on Astronomy and Kindred Fields of Popular Science Now Dave was as true as the Pole Star, and she was as false as a magnetic needle in a cargo of loadstone. Lost Face The truest of magnetic needles; but so sensitive, if you bring foreign iron near it! History of Friedrich II of Prussia — Volume 11 The magnetic needle in the binnacle was the point on which the Mary Turner ever pivoted. Michael, Brother of Jerry But in that year it occurred to Jean Christian Oersted, of Denmark, to pass a current of electricity through a wire held parallel with, but not quite touching, a suspended magnetic needle. A History of Science — Volume 3 Such a substance cannot be absolutely neutral as regards the deportment of the magnetic needle. Faraday as a Discoverer The magnetic needle will be set in motion and will deviate towards the west under that part of the conductor which comes from the negative pole of the galvanic battery. A History of Science — Volume 3 From those experiments it appeared that the magnetic needle could be moved from its position by means of a galvanic battery—one with a closed galvanic circuit. A History of Science — Volume 3 Our experiments also demonstrated that the said effects were not altered when we used a magnetic needle which was in a brass case full of water. A History of Science — Volume 3 Place a rectilinear piece of this conductor in a horizontal position over an ordinary magnetic needle so that it is parallel to it. A History of Science — Volume 3 In these memoirs he discusses the effects of heat and cold upon the magnetism of the air, and the action on the magnetic needle, which must result from thermal changes. Faraday as a Discoverer A needle of brass which is hung in the same way as the magnetic needle is not set in motion by the influence of the conductor. A History of Science — Volume 3 |
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