1141 557 Dry cell battery to power the sounder 352 155 116 80 1141 557 Spark gap between metal balls attached to wire dipole antenna 141 178 70 249 1141...
English: receiver unit 1243 1377 905 461 4440 3065 English: Spark gap for the transmitter 2248 1477 932 511 4440 3065 English: Transmitter coil to produce...
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