Blinky

Compact 9-volt transistorized, incandescent flasher is adjustable from 5-20 flashes per second. When photographed with an open shutter Polaroid camera, a series of white dots appears on the film enabling quantitative analysis. The Blinky may be calibrated by hooking it to an oscilloscope, and switched on and off without disturbing a pre-set flash rate. The flasher unit is built into a molded black plastic casing.