rements possible with the ordinary chronograph mercurial contact for closing the circuit every time the ranged to produce four poles in the armature. The may be carried on in connection with the phonograph. pendulum swings. The phonograph cylinder is sur- commutator brushes are held 90° apart by a… … pendulum and the springs, so that The motor is shunt-wound, and adapted to a two- thecircuit may be closed upon the bell by the pendulum, ampere current having a pressure of two volts. It the circuit closing springs on the phonographic cylin- der, or the key, and these may be made to act simul- may…
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