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 347
elay is energized, but almost ready to fall back. If the bus bar pressure falls to 46 volts, the low relay falls back,pulling up relay A which locks itself, pulls up the low relay again, andstarts the switch motor to rotating the counter-cell switch to removeanother cell. This brings back the bus… … Fig. 274.—Automatic voltage regulation for C.A.X. contacts. When the shaft rotates a little, springs S close and energizerelay C. When the switch reaches the next contact, the springs S openagain, cutting off battery from relays C and A. The latter falls back atonce; the former being…
Telephone
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