Building simple circuits, electric bell and telegraph set

Function

Intended for experimental study, physics laboratory, natural sciences, carrying out physics experiments, natural sciences, on: Physics. Electricity. Electromagnetism. A simple circuit with a telegraph. The telegraph. The transmission, sending the signal that carries the message. Receiving the signal. Recording the message. The simple electrical circuit and its components. A simple circuit with an electric bell. The operation of the electric doorbell. The simple electrical circuit and its components, etc. Note: Does not include batteries.