. Practical wireless telegraphy; a complete text book for students of radio communication . rly mounted andspaced on an insulated base. The secondary winding L-1, mounted on amovable base, permits the coupling between itand the primary winding L to be quickly andeasily adjusted. The wave-length changing switch operatedby the handle H, has two single blade contactswhich when thrown to the right simultaneous-ly connect such values of inductance in theantenna circuit and closed oscillation circuit asto give each circuit a period corresponding to600 meters. When thrown to the left bothcircuits are
. Practical wireless telegraphy; a complete text book for students of radio communication . rly mounted andspaced on an insulated base. The secondary winding L-1, mounted on amovable base, permits the coupling between itand the primary winding L to be quickly andeasily adjusted. The wave-length changing switch operatedby the handle H, has two single blade contactswhich when thrown to the right simultaneous-ly connect such values of inductance in theantenna circuit and closed oscillation circuit asto give each circuit a period corresponding to600 meters. When thrown to the left bothcircuits are given a wave-length of 300 meters,provided the short-circuiting switch of theshort wave condenser X is open. The correct number of primary and second-ary turns for the 300 and 600 meter waves aredetermined by means of a wavemeter and con-nection therefor made through the flexibleconnectors E and E-1. The taps on the sec-ondary inductance are located in the same manner Two values of inductance for the i- j tt i sTandard wave lengths are selected through the flexible conductors F and F-1. _—d Fig. 265- -Rear View of the Marconi Yi Cycle Transmitter. W. The st>ark discharger is of the multiple plate series type (quenched gap), consisting of ™*T„?.nS™tSy»^^^^^^^ . .eparaW by .p«.% treated fibre washers. Cooling is effected by means of a The discharge plates are of copper carefully ground, presenting~ie plates are separated by speciallysmall direct current blower J. Themotor circuit includes aswitch for starting and stopping purposes. The synchronous rotary gap discharger Y is mounted °^^}^%Z^^l^:^LTZa^^^ The rotating member has six discharge e^^^^eswhil the stationa^^y electrode^ are is 240 sparks per second. 246 PRACTICAL WIRELESS TELEGRAPHY. The aerial tuning inductance of the continuously variable type, represented at L-2, is con-nected in series with the earth lead and consists of a single spiral of copper ribbon having asliding contact U whic
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
