The electric connection between the carbon and the coil
of the electromagnet is maintained by the flexible wire, S.
[Illustration: FIG. 3.]
The electromagnet, A (Fig. 1), is fixed to a long and heavy rack, C,
which falls by its own weight and by the weight of the electromagnet and
the carbon fixed to it. The length of the rack is equal to the length of
the two carbons. The fall of the rack is controlled by a friction break,
B (Fig. 3), which acts upon the last of a train of three wheels put
in motion by the above weight. The break, B, is fixed at one end of
a lever, B A, the other end carrying a soft iron armature, F,
easily adjusted by three screws. This armature is attracted by the
electromagnet, E E (whose resistance is 1,200 ohms), whenever a current
circulates through it. The length of the play is regulated by the screw,
V. The spring, L, applies tension to the break.
_The Regulator_.--This consists of a balance and a cut-off.
_The Balance_ (Figs. 4 and 5) is made with two solenoids. S and S',
whose relative resistances is adjustable. S conveys the main current,
and is wound with thick wire having practically no resistance, and S'
is traversed by a shunt current, and is wound with fine wire having a
resistance of 600 ohms.
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