. An elementary manual of radiotelegraphy and radiotelephony for students and operators . >hite of the small loiulenser K which is in con-nection with the disc A is char{,ed by a spark passinj, Ijctweenthe central disc and one of tlie side discs. Sup|K)se this actionchar<,e8 the said jdate of the small condenser positively. Thisthen strengthens the electric ficM hctwecn the middle disc andthe other side disc, and a discharge happens on that side whichreverses the sign of the charge on the small condenser plateattached to the middle disc. These reversals of chai-ge rapidlysucceed each oth
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . >hite of the small loiulenser K which is in con-nection with the disc A is char{,ed by a spark passinj, Ijctweenthe central disc and one of tlie side discs. Sup|K)se this actionchar<,e8 the said jdate of the small condenser positively. Thisthen strengthens the electric ficM hctwecn the middle disc andthe other side disc, and a discharge happens on that side whichreverses the sign of the charge on the small condenser plateattached to the middle disc. These reversals of chai-ge rapidlysucceed each other, each taking place with oscillations, and the. Fig. 22.—Marconi High-speed Disc Discharger. effect is to produce almost unintermittent oscillations in the coilF, in series with the small condenser E. This dischai-ger, there-fore, affords a means of obtaining practically unintermittentoscillations from a continuous current dynamo machine, whilstthe rapid rotation of the discs prevents the formation of a directcurrent arc which would otherwise stop the process. The principleof the discharger is therefore entirely different from that of theDuddell-Poulsen method of obtaining undamped oscillations froman electric arc. In the case of the discharger, as shown in , the discharges are intermittent, but succeed each other veryrapidly. 274 RADIOTELEGRAPH Y These Marconi dischargers work with great efficiency, andpermit very rapid signalling to be conducted with them. The new Cape Breton or Glace Bay station in ISTova Scotiahas an antenna of 200 wires rising 220 feet vertically, and thenextended 1000 feet horizontally, at a height of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
