Speed Indicator Warns Driver by Flashing Red Light (Oct, 1938)
Speed Indicator Warns Driver by Flashing Red Light
When the automobile exceeds a predetermined speed, a new indicator flashes a red light to warn the driver. The indicator, made in the form of a devil’s head, is red. Inside it is a light which is turned on when electrical contact is established by a metal disk actuated by air current from the automobile’s fan. The air current fluctuates in relation to the motor speed. Tension of the disk may be adjusted by means of a regulator on the dash. The indicator is small and may be hooked to the fabric in the top of the car, at the driver’s left.