REMOTE CONTROL

"How automobile traffic signals are made to turn on and off by electrical devices that count waiting cars on red signals. How the trains are switched to correct tracks from traffic towers by electrical devices. Very good for units on transportation. Not technical, but could be used in science classes to motivate a study of how such devices operate." Collaborator. "Advertises General Motors Vacuumatic Gear Shift. But this is subordinated to other examples of remote control. Rather superficial but useful." Collaborator.