Abstract
Since the mechanical engineer is vitally concerned with control mechanisms involving electronics in some form, the author believes the explanation of theory involved and design of electronic apparatus given in this paper should be helpful. The almost infinitely fast and inertialess electronic tube can supplement mechanical control to produce many results hitherto considered impossible. After outlining the fundamental conceptions of the electronic tube, describing the types of tubes used, and explaining something of the operation of individual control circuits, the author indicates practical applications of electronics to standard control circuits. Examples of such controls are the photoelectric relay, electronic timer, motor control, resistance welding, photoelectric register control, and others.
