Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 156
RESISTANCE LAMPS- CABLE FROM LAMP TO LOCAL BATTERY FUSES CABLES TO7)-^ DISTRIBUTINGZS Ir FRAME REAR VIEW OFCABLING FORFLOOR DUCTS FRONT VIEW with the loop switchboard, twenty A, four D, ten E andtwenty F circuits being employed. Circuits for combinedtelegraphy and telephony are also provided where… … RESISTANCE LAMP (3-12 OHMS PER VOLT) JACKS I JACKSLZ y^n y=^n J=^n *c=^ 0 - CLOSED BATTERY GROUPS 20 - TWO-WIRE TRUNKS (FROM ONE■ END OF BOARD TOOTHER) POLE CHANGER
Telegraph
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