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 87
Chain RlyContacts Fig. 67.—Circuit of impulse repeater. switch the ground connection of the line relay from dial tone to busy tone. Repeater Circuits.—Automatic impulserepeaters are introduced in outgoing trunksfrom one office to another. (See Fig. 68.) r-i■^ SP^^ < PurPoses °f ;l repeater are…
Telephone
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