. An elementary manual of radiotelegraphy and radiotelephony for students and operators . ■Q)—^rr&r^ L0-J Fig. 21.—Diagram of connections for Ctiaffee discharger. If a secondary circuit is connected to the condenser circuit (seeFig. 21), then in this secondary circuit we have a close sequenceof feebly damped discharges which are practically equivalent toan undamped oscillation. Two other methods have been devised which accomplish verymuch the same thing. Galletti has invented a method, the scheme of connections ofwhich is shown in Fig. 22,in which a number of con-densers, Ci, C2, C3, etc., eac
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . ■Q)—^rr&r^ L0-J Fig. 21.—Diagram of connections for Ctiaffee discharger. If a secondary circuit is connected to the condenser circuit (seeFig. 21), then in this secondary circuit we have a close sequenceof feebly damped discharges which are practically equivalent toan undamped oscillation. Two other methods have been devised which accomplish verymuch the same thing. Galletti has invented a method, the scheme of connections ofwhich is shown in Fig. 22,in which a number of con-densers, Ci, C2, C3, etc., eachin series, with an inductiveresistance, Ei, E2, E3, etc.,are charged off constantpotential mains through acommon condenser Cq. Eachcondenser, when charged,discharges through its ownspecial gap, Ti, T2, T3, etc. The peculiarity of this arrangementis that these discharges do not take place simultaneously butsuccessively, so that in one common inductance, L, there is a. Fig. 22.—Diagram of connections ofGalletti multiple discharger. UNDAMPED ELECTRIC OSCILLATIOXS closely sequent scries of oseillulions, and these can lie made tocreate similar secondary oscillations in another syntonic coupledcircuit. Galletti states that he can in tliis manner produce asmany as 10,000 sparks per second which follow each other atregular intervals. Another and perhaps better method of producing a closesequence of spark dischari,es }>ractically equivalent to anundamped oscillation is due to Marconi. In this case theinventor employs a set of his rotating studded disc dischargersdescribed in Chapter VII. These studded discs are all set onone shaft, but insulated from each other. The discs are eachconnected with a se})arate inductance and condenser (see Fig. 23)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
