Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 355
of current than is actually nec-essary. In order to prevent the operation of the ringing key from discon-necting the battery from the called line during the ringing of a sub- THE COMMON BATTERY MULTIPLE SWITCH-BOARD. 333 scriber, and thus allowing the ringing current to rattle the armatureof the… … the calling line during the ringing for the purpose of keeping thecut-off relay constantly energized, this feature being almost thesame as that described in the Kellogg system. The Stromberg-Carlson Company has recently adopted a three- 334 AMERICAN TELEPHONE PRACTICE. wire system which it is now…
Telephone
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