caption: The image shows a black and white drawing of a radiotelegraph, a type of machine used to transmit signals from one source to another. It has a cylindrical shape with a handle on the side and a spindle at the top. The radiotelelegraph is composed of several components, including a motor, a receiver, and a control panel. The motor is connected to the receiver and the control panel, which is used to control the speed and direction of the signal.