Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 607
t follow the armature in its motion towards the electro-magnet,and consequently the circuit is broken before the armature touches themagnet; but the hammer strikes the bell, and the elasticity of the spring, THE ELECTRIC 2ELEGRAPH. 555 B, brings the armature back into contact with K, the circuit is… … Fig. 283.—Electro-Magnetic Bells. Below the dial of the instrument, in Fig. 282, may be seen two handles.Each of these is connected with an arrangement constituting the trans-mitting apparatus, by which the metallic contacts are varied according to theposition of the handles. When the handle is…
Inventions
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