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 395
he private magnet; the private magnetupon de-energizing will allow the side-switch wiper to pass to secondposition. When the tester calls the next figure, a seven for example, the relay Awill momentarily de-energize seven times, and will send seven impulses ofcurrent over a circuit which may be… … POWER PLANT, SUPERVISORY AND TESTING EQUIPMENT 371 The rotary magnets will energize over this circuit and will operate torotate the shaft and wipers into engagement with the bank contactsassociated with test connector number 67. The series relay will operateas before to close the circuit of the…
Telephone
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