Wireless Telegraphy and High Frequency Electricity: A Manual Containing Detailed Information for the Construction of Transformers, Wireless Telegraph and High Frequency Apparatus, with Chapters on Their Theory and Operation

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The author, 1909 - Electricity - 202 pages
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Page 185 - These balls are connected in another circuit, consisting of a condenser C and an inductance L in series. When the spark balls are brought in contact, a current is drawn through the inductance L. If the balls are separated, the condenser will become charged by the difference of potential created, and Fig.
Page 183 - ... is about the least known being an ordinary arc lamp, energized by a direct current. The difference between the two being that in the former they are damped and in the latter they are undamped or continuous. Undamped or persistent oscillations are high frequency alternating currents, just as are the alternating currents used for electric lighting and the transmission of power, the only difference being that the frequency of one is anywhere from 1,000 to 100,000 times greater than the other.
Page 183 - ... tuning, will never be eliminated and perfect tuning will only be possible by using undamped or persistent electric oscillations. Since the possibility of the wireless telephone depends entirely upon the production of such oscillations and suitable means for varying them, we may predict that in the near future the wireless telephone will not only progress far ahead- of the wireless telegraph, but take its place.
Page 59 - They allow the current to flow in one direction, but not in the other, and they thus shunt an undirectional, intermittent current through the telephone.
Page 164 - A force sufficient to impart a velocity of one centimeter per second to a mass of one gramme.
Page 193 - Upon further investigation more detailed specifications will be made public in the near future. 191 cool surface is presented to the arc, and in that it prevents the burning away of the electrodes which gives rise to untoward variations in the frequency of the oscillations, and finally in that the optumum length of the arc, namely, at the length when the frequency of the oscillations is the greatest, may be maintained for long periods of time, which is quite impossible when the carbons are stationary.
Page 192 - In experimenting with this arc with different gases, the author has discovered that certain conditions existed in the arc chamber heretofore unknown, one being that certain gases under certain conditions do not burn continuously but explode with a very great rapidity. It was on one occasion when using this gas in connection with the arc that undamped oscillations were obtained in the aerial system which indicated two times as much current on a hot wire ammeter than w,as previously obtained.
Page 191 - One oŁ the bearings in the shaft is mounted in a keyed sleeve which permits the spindle carrying one of the disks to be moved toward or away from the opposite disk so that the length of the arc can be varied while the lamp is in operation. The carbon electrodes are placed in a metal casing while the rotating mechanism is attached to the bottom casing.
Page 191 - In order to accomplish this in practice, he employs a pair of carbon or graphite disks as the anode and the cathode. These disks are mounted on parallel spindles so that they are in the same plane and are connected by means of beveled gears to an insulated shaft." "The disks are insulated from each other by fiber bushings inserted in the gearings, the casing forming one of the connections, while the insulated bearing in the bottom of the casing forms the other. The gearing is so arranged that carbon...
Page 184 - ... and a rotating armature in the form of a fly wheel. The magnet had 400 radial poles in the circumference and 400 coils on the armature. When driven at a speed of 3,000 revolutions per minute or 50 per second, it produced an alternating current of 10,000 cycles. The output of this was limited to a small amount of energy, probably not more than ]/2 kilowatt. It was dangerous, however, to run such a machine.

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