Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 222
arries a vertical lever, which has a limited vibration THE TELEGRAPH AND TELEPHONE. 199 between two platinum points attached to set-screws, sup-ported on a curved yoke, as shown; the left set-screw beinginsulated from this yoke. Two spiral springs, connectedwith this armature, a weak one below, and… … Fig. 87. The circuit of the local battery includes the sounder,and is connected with the two binding-posts on the left,one of which is connected with the armature and attachedlever, and the other with the curved yoke, through itssupport. When there is no current in the main circuit, the leveris…
Electricity
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