urements 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. commutator brushes are held 90° apart by a curved pendulum swings. The phonograph cylinder… … circuits of the Fig. 3.-THE PHONOGRAPH AS A CHRONOGRAPH. pendulum and the springs, so that The motor is shunt-wound, and adapted to a two- the circuit 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…
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