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 127
Fig. 90.—One-hundred-line switchboard, rotary lineswitches (back). r9 ? ? 9 9 ? rt.P.ti i i i l i I i i Connectors LincLP.F) l.Sw.Bd. … To Selectors orSecondary L. Sw. Fig. 91.—Line intermediate distributing frame. The two shelves are hinged to swing outwardly. (Fig. 89.) Thisexposes the wiring and the condensers of the connectors. At the top isthe terminal assembly. TRUNKING, ITS PHYSICAL ARRANGEMENTS AND VARIATIONS 111 The back…
Telephone
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