The brass bracket communicates with one of the two terminals for connection to the primary Ruhmkorff coil; the other terminal is connected to the commutator and then to the other pole of the generator. In this way, the primary Ruhmkorff coil has one of its ends connected directly to one of the poles of the generator and the other end to the other pole, through the mercury switch.
Also the rod with the platinum tip of the auxiliary switch is attached to the longer arm of the brass lever, but centrally. It, through the same arm, the copper reed and its support, is connected to one of the terminals of the electromagnet. The other terminal of the electromagnet is connected directly to the commutator and thus to the other pole of the pile. Thus, the electromagnet has one terminal connected directly to one of the poles of the pile and the other to the other pole through the mercury switch.
Above the flexible reed there is a steel rod with a spherical brass counterweight that can be set at different heights; when it is removed from its position of equilibrium and then let go, it oscillates at a frequency depending on the height at which the counterweight was set. At the end of the shorter arm of the lever there is a soft-iron bar (plate) which falls near the expansions of the electromagnet. ...continues