. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 90.—One-hundred-line switchboard, rotary lineswitches (back). r9 ? ? 9 9 ? i i i l i I i i Connectors ) 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 of the frame (Fig. 90) supports the connectors on threeshelves of eight switc

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. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 90.—One-hundred-line switchboard, rotary lineswitches (back). r9 ? ? 9 9 ? i i i l i I i i Connectors ) 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 of the frame (Fig. 90) supports the connectors on threeshelves of eight switches each. Three of the connectors have theircovers removed. The one at the extreme right of the bottom shelf is atest connector, used by a tester at the wire chiefs desk. One connectoris not installed, the bank being held by a support. At the left are three little fuse panels, one for each shelf. There is onefuse per connector. At the top is another fuse panel with one fuse foreach ten lineswitches.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19