Exterior shot of a long range radio transmitting station. Men inside work at large consoles of meters and controls. Small machines spark. Shot of an office building. Two men pour over designs for a new transmitter. Close ups of the two men in discussion. The men discuss a chalk diagram on a blackboard. Close up of fingers holding up a small prototype of the device. Shot of the needle jumping on a volt meter. A hand points at an x-ray of a torso. Shots of an oscilloscope.