Page:Life in Motion.djvu/63

Rh indicated by the movement of the spot of light, but it is in the opposite direction. These instantaneous currents from what we call the

secondary coil are the Faradic or induced currents. They last only a minute fraction of a second of time. An induction coil, then, consists of a primary coil, with which a galvanic cell is connected, and a secondary coil. When the