| 单词 | spark gap |
| 例句 | The spark gap is warmed by a small lamp l contained in the box. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Let us then suppose that the insulation of the spark gap is destroyed, so that the opposite electric charges rush together and oscillate to and fro. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The spark gap of the average plug is equal to about 1⁄32 of an inch for coil ignition and 1⁄40 of an inch when used in magneto circuits. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Frank sat down at the key and, depressing it, sent a blue-white flame crackling across the spark gap. The Boy Aviators' Flight for a Fortune 2011-08-27T02:00:19.473Z This apparatus acts, as a powerful and effective interrupter and takes the place of the spark gap now used in discharging the condensers for setting up electrical waves. The Universe a Vast Electric Organism 2011-06-09T02:00:22.450Z Then sparks may jump between the wires and streamers become visible in the dark if the light of the discharge through the spark gap d d be carefully excluded. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z There are obviously two things which may be done; first, we may increase the capacity of the aerial, and secondly, we may increase the charging voltage or, in other words, lengthen the spark gap. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Then turn over the motor, thus revolving the magneto armature, and see if a spark is produced at the spark gaps of the plugs. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z The spark gap consisted of a ball and a point, the ball being connected with the electroscope and the point with a battery of 200 dry cells. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The wires leading from the spark gap connect with this solution. Astounding Stories, July, 1931 As if to complete this illustration for a bronze-age edition of "First Steps in Electricity" another cable twisted up from the spark gap and vanished out a small window. The Ethical Engineer If we lengthen the spark gap too much, its resistance becomes too great and the spark ceases to be oscillatory. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The most common defects in spark-plugs are breaking down of the insulation, fouling due to carbon, or too large or small a spark gap. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z He objected to the hum of motors and he jumped every time he saw the flashes from the wireless spark gap. The Boy Scout Fire Fighters By lengthening the wires between the spark gap and the camera the light is allowed to arrive first. Astounding Stories, July, 1931 The spark gap is made of a hard-wood base with two uprights to which are fastened strips of brass. Boy Scouts Handbook The First Edition, 1911 System of inducing Electromotive Force in an Aerial, A. B, battery; K, key; I, induction coil; S, spark gap; C, Leyden jar; E, earth plate; ps, oscillation transformer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The spark gap should be about 1⁄32′′ and never less than 1⁄64′′. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Five varying toothed discs for the rotary spark gap yield five different signal tones and nine different wave lengths are possible. The Radio Boys Trailing a Voice or, Solving a Wireless Mystery It is this sudden release of the dammed-up current across the spark gap that causes the temporary magnetic field and the difference in the appearance of the light from the spark. Astounding Stories, July, 1931 This is tested by always having a spark gap, conveniently formed by the coil terminals, in parallel with the tube. On Laboratory Arts Apparatus for showing Stationary Waves in long Solenoid A. I, induction coil; S, spark gap; L, inductance coil; C1C2, Leyden jars; E, earth wire. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The spark gap is not uniform over the entire surface of the block but is made wedge-shaped by grinding away the line carbon as shown. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. In the steam-line casing of the alternator the rotary spark gap, alternator, potential transformer, condenser and oscillation transformer are self-contained. The Radio Boys Trailing a Voice or, Solving a Wireless Mystery When the electrical current jumps across the spark gap it sets up a momentary current in a set of wires running the length of the corridor and connected with the camera. Astounding Stories, July, 1931 As soon as sparks begin to pass between the terminals of the spark gap it becomes necessary to watch the process of exhaustion very carefully. On Laboratory Arts When the discharge takes place the electric arc is blown out, but if the balls are short-circuited by a condenser the oscillatory discharge of the condenser still takes place across the spark gap. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Such devices consist of two conductors separated by an air space or other insulator and are variously known as lightning arresters, spark gaps, open-space cutouts, or air-gap arresters. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. "I'm goin' to get busy with the spark gap," Cub announced suddenly, as he sprang to his feet. The Radio Boys in the Thousand Islands A spark gap for the impulse production of oscillating currents. The Radio Amateur's Hand Book In any case the sparking should now be continued, the pump being at rest, and the variations of tube resistance watched by adjusting the spark gap. On Laboratory Arts Professor Elihu Thomson achieves the same result by employing a blast of air thrown on the spark gap. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Boys came and went, Mr. Ellsworth and others departed hastily with Doc, the little group in the lean-to watched and waited while Tom, apparently unconscious of all about him, sat there adjusting his spark gap. Tom Slade : Boy Scout of the Moving Pictures A spark gap in a vacuum, connected with a free end of wire, gave a continuous discharge. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 Don't use too long or too short a spark gap. The Radio Amateur's Hand Book From the condenser, electrical energy is discharged each time the spark discharge passes at a spark gap in the form of electrical oscillations set up in the primary circuit of an oscillation transformer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The next element of importance in the transmitting arrangement is the spark gap. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Professor R. A. Fessenden has also made some interesting observations on the effect of using compressed air round spark gaps. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The writer has also made experiments with an apparatus designed to study the effect of compressed air round the spark gap. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Don't fail to use a safety spark gap between the grid and the filament terminals where the plate potential is above 2,000 volts. The Radio Amateur's Hand Book There is, however, a growing tendency among amateurs to use continuous wave transmitters and they are certainly more up-to-date and interesting than spark gap sets. The Radio Amateur's Hand Book The advantage in using compressed air round the spark gap is that we can increase the effective potential difference between the balls without rendering the spark non-oscillatory. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This kind of a transmitter sets up sustained oscillations instead of periodic oscillations which are produced by a spark gap set. The Radio Amateur's Hand Book The transmitter of a wireless telegraph set generally uses a spark gap for setting up the electric oscillations, while usually for wireless telephony a vacuum tube is employed for this purpose. The Radio Amateur's Hand Book Don't use spark gap electrodes that are too small or they will get hot. The Radio Amateur's Hand Book The resistance of a circuit to high frequency currents is generally found in the spark gap, arc gap, or the space between the electrodes of a vacuum tube. The Radio Amateur's Hand Book I, induction coil; CC, condensers; S, spark gap; J, transmitting jigger; K, receiving jigger; F, filings tube; R, relay; B, battery. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Now when the condenser is fully charged it discharges through the spark gap and then the electric oscillations set up surge to and fro through the closed circuit. The Radio Amateur's Hand Book GAP, NON-SYNCHRONOUS.—A rotary spark gap run by a separate motor which may be widely different from that of the speed of the alternator. The Radio Amateur's Hand Book Don't—no never—connect one side of the spark gap to the aerial wire and the other side of the spark gap to the ground. The Radio Amateur's Hand Book Rotary.—A spark gap with a pair of fixed electrodes and a number of electrodes mounted on a rotating element. The Radio Amateur's Hand Book I, induction coil; A, aerial; E, earth plate; HH, choking coils; S, spark gap; J, transmitting jigger; K, receiving jigger; R, relay; C, condenser; F, filings tube; B, battery. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Quenched.—A spark gap formed of a number of metal plates placed closely together and insulated from each other. The Radio Amateur's Hand Book Marconi was the first to connect an aerial to one side of a spark gap and a ground to the other side of it. The Radio Amateur's Hand Book GAP, SYNCHRONOUS.—A rotary spark gap run at the same speed as the alternator which supplies the power transformer. The Radio Amateur's Hand Book He used an induction coil to energize the spark gap, and a telegraph key in the primary circuit to break up the current into signals. The Radio Amateur's Hand Book I, induction coil; S, spark gap; A, aerial; CC, condensers; E, earth plate; R, relay; L, variable inductance; F, filings tube; B, battery. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This done, connect the middle spring clip with one of the posts of the spark gap, and, finally, connect the top clip with the aerial wire and your transmitting set is ready to be tuned. The Radio Amateur's Hand Book The Secondary Spark Coil Circuit.—This includes the secondary coil and the spark gap which are connected together. The Radio Amateur's Hand Book A spark gap, without the hyphen, means the apparatus in which sparks take place; it is also called a spark discharger. The Radio Amateur's Hand Book The ends of the secondary coil lead to two binding posts, which are usually placed on top of the spark coil and it is to these that the spark gap is connected. The Radio Amateur's Hand Book Mr. Jervis-Smith has also described an experiment to show how much the use of compressed air round a spark gap is of advantage in working an ordinary Tesla coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The Spark gap.—It is in the spark gap that the high tension spark takes place. The Radio Amateur's Hand Book The apparatus in which the spark takes place is also called the spark gap. The Radio Amateur's Hand Book When fitted with a spark gap the high voltage, low frequency currents are converted into high voltage, high frequency currents. The Radio Amateur's Hand Book This is very much the way in which a quenched spark gap sets up oscillations in a coupled closed and open circuit. The Radio Amateur's Hand Book In his British specification, No. 12,039 of 1896, Mr. Marconi had long previously mentioned the use of compressed air round the spark gap. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z A quenched spark gap not only eliminates the noise of the ordinary gap but, when properly designed, it increases the range of an induction coil set some 200 per cent. The Radio Amateur's Hand Book Now connect the motor of the rotary spark gap to the power circuit and put a single-pole, single-throw switch in the motor circuit, all of which is shown at A in Fig. The Radio Amateur's Hand Book When the alternating, but high potential, currents which are developed by the secondary coil, reach the balls, or electrodes, of the spark gap the latter are alternately charged positively and negatively. The Radio Amateur's Hand Book This is called a fixed, or stationary spark gap and costs about $1.00. The Radio Amateur's Hand Book B, battery; I, induction coil; K, signalling key; S, spark gap; A, aerial wire; E, earth plate. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z |
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