Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 265
quence switches, 30 of them, one foreach brush rod. They are operated byfriction clutches from a vertical shaft attheir left. To the right of the sequence switchesare the relays and resistances coveredby boxes to keep out the dust. The bank itself (Fig. 208) is built upout of alternate strips of… … lit,,,.... .mmam. PIJ,li.H8.0»ir<J.;?!ifi
Telephone
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