Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 229
often associated directlywith the bell as shown in this figure. The principal circuits used in magneto switch-boards, and also MAGNETO SWITCH-BOARD FOR SMALL EXCHAyCES. 207 many of the various pieces of apparatus, such as drops, jacks, ring-ing and Hstening keys, etc., which go to make up such… … FIG. 101.—STAND.VRD TYPE OF SWITCH-Bd.XRD—FRONT \IEW. main points to be sought in assembling the separate pieces of ap-paratus into a complete switchboard, are that the arrangement maybe such as to facilitate the work of the operator; that all parts liableto get out of order shall be readily…
Telephone
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