caption: The image shows a black and white drawing of a machine with a gearbox, which is a mechanism used to control the speed of a motor. It has a cylindrical shape with a handle on the side and a spindle at the top. The gearbox is connected to the motor by a series of wires and cables, and the gears are arranged in a circular pattern around the spindle. The machine is surrounded by a few other components, such as a control panel, a gear wheel, and a control arm.