. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . Fig. 74. Wireless Telegraphy. 251 Figures 74 and 75 are diagrams of asimple circuit, Fig. 74 being the transmittingapparatus and Fig. 75 the receiving appa-ratus. In Fig. 74 P P and wS vS are the primaryand secondary of a Ruhmkorff coil, D twobrass balls on the discharger, B the battery,K a key, in place of the usual contactbreaker, which is either absent or screweddown; V a wire leading from
. Induction coils : how to make, use, and repair them including Ruhmkorff, Tesla, and medical coils, Roentgen radiography, wireless telegraphy, and practical information on primary and secondary battery . Fig. 74. Wireless Telegraphy. 251 Figures 74 and 75 are diagrams of asimple circuit, Fig. 74 being the transmittingapparatus and Fig. 75 the receiving appa-ratus. In Fig. 74 P P and wS vS are the primaryand secondary of a Ruhmkorff coil, D twobrass balls on the discharger, B the battery,K a key, in place of the usual contactbreaker, which is either absent or screweddown; V a wire leading from one arm ofthe discharger up into the air, of a heightvarying with the results desired; G a groundplate in connection with the other dischargerarm. The coil condenser is left out of the dia-gram for sake of clearness; but, of course,is necessary to the operation of the appa-ratus. In Fig. 75, C is the coherer, also calledthe Branly tube, or radio conductor; 6^a telegraph sounder, or electric bell; R arelay; R B and L B the relay battery andlocal battery, respectively; G a ground con-nection; M a resistance, or choke coil, and. — Choke Coil. N = Resistance Coil. Fig. 75. Wireless Telegraphy. 253 V a vertical wire, as in the transmitter; infact, in the station set the same vertical wireanswers for both transmitter and coil to be used may be from twoinches of spark upwards, dependent uponthe distance the signals have to travel. Therelay battery may be two cells of dry battery,the local battery as much as is desired tooperate the bell, sounder, or pen registerreceiving the signals. Presuming the appa-ratus set up and adjusted, and designatingthe transmitter as Station A and the receiveras Station B, the operation will be as fohlows: A pressure and release of key K sendsan impulse of current through the primaryP, inducing a current in S, which manifest;itself by a spark between the discharger balls-at D. An electric wave is released, which,starting from V, Statio
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