| 单词 | Iceland spar |
| 例句 | Light from the sky is polarised and, as he discovered in 2011, looking through a piece of Iceland spar reveals the direction of polarisation, and thus the direction of the sun, to within 5°. Navigation: Crystal gazing 2013-03-07T16:08:25Z Here we are helped by the property of Iceland spar, which is able to split up a ray into two divergent rays. Colour Measurement and Mixture 2012-02-27T03:00:13.987Z Spar, sp�r, n. a term applied by miners to any bright crystalline mineral, and adopted by mineralogists in the names of a number of minerals—calcareous spar, fluor spar, Iceland spar, &c.—adj. Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) 2012-01-30T03:00:19.113Z Iceland spar is a form of calcite that splits light into two beams. Viking navigation: Sunstruck 2011-11-02T18:18:03Z After three days he worked with common electricity, trying glass, heavy optical glass, quartz, Iceland spar, all without effect, as on former trials. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" 2011-06-19T02:00:16.580Z Here is a mass of Iceland spar, which also cleaves in three directions, not at right angles, but obliquely to each other, the resulting solid being a rhomboid. The Glaciers of the Alps Being a narrative of excursions and ascents, etc. Dove's Iceland spar prism is also useful, when two pigments have to be worked on to paper, so as to be complementary. Colour Measurement and Mixture 2012-02-27T03:00:13.987Z Schists and different productions of limestone were found in abundance, as was also a sort of strange, transparent, colorless crystal, which has a refraction peculiar to Iceland spar. The Voyages and Adventures of Captain Hatteras A, simple lens; B, piece of Iceland spar with glass prisms on ends to square them up; C, square hole. A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Iceland spar also cleaves in three directions, not at right angles, but oblique to each other, the resulting solid being a rhomboid. Fragments of science, V. 1-2 Transparent calcite, a mineral commonly called "Iceland spar," is found, one mine of which furnishes an excellent quality. Wealth of the World's Waste Places and Oceania One uses Iceland spar under colossal pressures, that is all. The Worlds of If When very pure and transparent the substance is called Iceland spar. An Elementary Study of Chemistry It was shown by Brewster that certain natural specimens of Iceland spar are traversed by thin twin strata. Scientific American Supplement, No. 711, August 17, 1889 The Iceland spar has the power of polarizing light and producing great richness and variety of color. Browning's Shorter Poems Iceland spar is used chiefly in the optical instrument known as the polariscope. Wealth of the World's Waste Places and Oceania Most of it was merely a Horsten psychomat, but glittering crystalline and glassy was the prism of Iceland spar, the polarizing agent that was the heart of the instrument. The Worlds of If The paper also contains an account, although not an exhaustive one, of the various polarizing prisms which have from time to time been constructed by means of different combinations of Iceland spar. Scientific American Supplement, No. 441, June 14, 1884. And none can read his investigation of the phenomena found in Iceland spar without marvelling at his insight and sagacity. Treatise on Light In Iceland spar there is one direction round which the crystalline molecules are symmetrically built. Six Lectures on Light Delivered In The United States In 1872-1873 Adopting the same principle on a larger scale, I have had constructed by Mr Hilger a micrometer with double refraction of a sphere of Iceland spar. Autobiography of Sir George Biddell Airy They were put out on the bed every evening in order of size, and ranged from a large lump of Iceland spar down to a small dead periwinkle. Not that it Matters Light is polarized in several ways—by reflection, by transmission, but most commonly through what I have here, a prism of calcite, or Iceland spar, commonly called a Nicol prism. The Treasure-Train You think in this latter mood that you have only to turn the crystal of Iceland spar about in order to have the whole thing plain. First and Last Things Malus made this discovery in 1808, while looking through Iceland spar at the light of the sun reflected from the windows of the Luxembourg palace in Paris. Six Lectures on Light Delivered In The United States In 1872-1873 The same remark applies to the line joining the opposite blunt angles of a crystal of Iceland spar. Faraday as a Discoverer We have seen and examined the two beams emergent from Iceland spar, and have proved them to be polarized. Six Lectures on Light Delivered In The United States In 1872-1873 Place a piece of Iceland spar over a dot of ink; two dots are seen, the one appearing nearer than the other to the eye. Six Lectures on Light Delivered In The United States In 1872-1873 On the screen before you are two disks of light produced by the double refraction of Iceland spar. Six Lectures on Light Delivered In The United States In 1872-1873 Now the refractive index of Iceland spar is, for the extraordinary ray less, and for the ordinary greater, than for Canada balsam. Six Lectures on Light Delivered In The United States In 1872-1873 By mechanical compression other bodies were also made to imitate the Iceland spar. Faraday as a Discoverer Double refraction is displayed in a particularly impressive manner by Iceland spar, which is crystallized carbonate of lime. Six Lectures on Light Delivered In The United States In 1872-1873 By means of Iceland spar cut in the proper direction, double refraction is capable of easy illustration. Six Lectures on Light Delivered In The United States In 1872-1873 He deduced from it the laws of reflection and refraction, and applied it to explain the double refraction of Iceland spar. Six Lectures on Light Delivered In The United States In 1872-1873 I now remove the analyzer, and put in its place the piece of Iceland spar with which we have already illustrated double refraction. Six Lectures on Light Delivered In The United States In 1872-1873 An able optician, named Nicol, cut a crystal of Iceland spar in two halves in a certain direction. Six Lectures on Light Delivered In The United States In 1872-1873 Hence, if a plate be cut from a crystal of Iceland spar perpendicular to the axis, all rays sent across this plate in the direction of the axis will produce but one image. Six Lectures on Light Delivered In The United States In 1872-1873 In 1808 Malus, looking through Iceland spar at the sun, reflected from the window of the Luxembourg Palace in Paris, discovered the polarization of light by reflection. Six Lectures on Light Delivered In The United States In 1872-1873 I now turn the Iceland spar: the needle remains fixed; there is no alteration of the deflection. Six Lectures on Light Delivered In The United States In 1872-1873 Iceland spar is another example of the same kind: its molecules are built symmetrically round the line uniting the two blunt angles of the rhomb. Six Lectures on Light Delivered In The United States In 1872-1873 |
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