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Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 156
S OR >- IG FRAME J- © … 64 - TWO WIRE TRUNKS TO MAIN SWITCH BD.20 - HALF-REPEATER LOOPS (2 FOR EACH )20 - FULL-REPEATER LOOPS ( 2 FOR EACH )24- DOUBLE LOOP REPEATERS (3 FOR EACH) o yOUNDER SOUNDERSWITCH [ L^ \ 11 ? ^ RESISTANCES ® 16-DUPLEX OR HALF-QUAD, REPEATER LOOPS, 8-TESTINGSET8 Fig. 6. 142 TELEGRAPH ENGINEERING…Telegraph
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