. An elementary manual of radiotelegraphy and radiotelephony for students and operators . na consists in interrupting the wire just above the earth andinterposing a pair of spark balls. These balls are then connected 150 RA DIO TELEGRA PIIV to the secondary terniiuals of an induction coil, and when the coilis in action the nppev part of the aerial is charged at intervals, say,.vith negative electricity. When this charge reaches a certainpotential the insulation of the air in the gap breaks down andelectric oscillations are tlius set up in the antenna. Prior to thedischarge the wire itself form
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . na consists in interrupting the wire just above the earth andinterposing a pair of spark balls. These balls are then connected 150 RA DIO TELEGRA PIIV to the secondary terniiuals of an induction coil, and when the coilis in action the nppev part of the aerial is charged at intervals, say,.vith negative electricity. When this charge reaches a certainpotential the insulation of the air in the gap breaks down andelectric oscillations are tlius set up in the antenna. Prior to thedischarge the wire itself forms one plate of a condenser, of whichthe surroundin<Jc earth is the other coating and the air and aetherthe dielectric. In this condition lines of electric strain stretchfrom the wire to the earth on all sides (see Fig. 2). When thedischarge takes place this condenser is discharged and the electricstrain in the spark gap disappears, owing to the air in the gapbecoming conductive. At this moment the charge in the antennarushes down into the earth, creating a conduction current in the.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
