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 131
the trunks which leave the banks of 1000 first selectors, although eachgroup of lineswitches is connected to only 100 first selectors. Selectors.—Selectors are mounted on fixed shelves, each of whichholds 20 switches. Fig. 98 shows a view of mounted selectors. Five orsix shelves are mounted on one… … lOSels. lOSels. lOSels Etc.Fig. 96.—Secondary intermediate distributing frame. SecondaryLine Switches First SelectorBoards Group A Group B Group C Etc
Telephone
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