. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 200b—Elevation of Type I Aerial Changeover Switch. variation of the sliding contacts of the potentiometers P-1 and P-2. 155. Type I Aerial Changeover Switch.—A plan view and side elevation ofthis switch appear in Figs. 200-a and 200-b, respectively. Several steel discs, B,which make connection with the spring contacts C on either side of the rod, aremounted on a hard rubber rod R. When the handle A is thrown downward a long 174 PRACTICAL WIRELESS TELEGRAPHY. RECEIVER TYPE N« 106 PHONES. TO TRiNSMlT
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 200b—Elevation of Type I Aerial Changeover Switch. variation of the sliding contacts of the potentiometers P-1 and P-2. 155. Type I Aerial Changeover Switch.—A plan view and side elevation ofthis switch appear in Figs. 200-a and 200-b, respectively. Several steel discs, B,which make connection with the spring contacts C on either side of the rod, aremounted on a hard rubber rod R. When the handle A is thrown downward a long 174 PRACTICAL WIRELESS TELEGRAPHY. RECEIVER TYPE N« 106 PHONES. TO TRiNSMlTTtR w m \^ -^f BATTERY ANTENNA SWITCHTYPE N» I steel bar F closes the circuit to the primary winding of the power transformerthrough the contacts 11 and 12. In the opposite position the bar separates thespring contacts M, M^ 200-a, which disconnects the transmitting: oscillation trans-former from the aerial during the pe-riod of reception, preventing the in-coming oscillations leaking to various circuits closed by thediscs mounted on the hard rubber rodplace the detector and head telephoneon short circuit during the period oftransmission. They may also be em-ployed to start and stop a motor bloweror an automatic motor starter. Thetype I switch is supplied with Marconitransmitting sets up to 5 K. W. ca-pacity. For the use of operators in the Marconiservice, the. circuit diagrams, Figs. 201, 202and 203, are published, showing the con-nections in Fig. 201 of the type I antennaswitch to the external binding posts of thetype 106 receiving tuner, and in Fig. 202the con
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
