At many airports the airport beacon is turned on by a photoelectric cell or time clocks, and ATC personnel cannot control them.
32.
As the can rotates, its holes pass the Drum Buddy's photoelectric cells, firing drum-like tones and theremin or Moog synthesizer-like chirps or buzzes.
33.
The Casel autopilot was using the then revolutionary photoelectric cells and a system of light and reflecting mirrors on the magnetic compass rose.
34.
An interesting feature of the canopy is a series of photoelectric cells generating electricity to offset the energy used by the bus station.
35.
As each lens rotated past the illuminated subject, it focused the light from a spot on the subject on a selenium photoelectric cell.
36.
While he was gone, Kunz and another Illinois physicists W . F . Schulz successfully tested a photoelectric cell photometer at the Observatory.
37.
It had a photoelectric cell beneath a cover which detonated the bomb if exposed to light to counteract the work of bomb disposal units.
38.
Due to the low sensitivity of the photoelectric cells, Baird's first system was not able to televise human faces, because they had inadequate contrast.
39.
When the light shines through the perforations in the rotating can, the light beams strike any of four photoelectric cells that trigger various electronic effects.
40.
It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light.
