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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 155
DIFFERENTIAL DROP LOOP SIMPLEX MORSE WIRE (C) TOOTHER 40-TWO WlRt MULTIPLE TRUNKS oF^^ei^Rl L^jT^^ 2 -OPEN GROUPS C)F JACKS jj^^n ^n ~±7u\ S-GROiaiD JACKS LINE OR QUAD.SET © Fig. 4. typical panel of the Western Union main switchboardfor terminal offices contains nine types of circuits, five ofwhich… … 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…Telegraph
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