1. He placed infrared photo cells at intervals on a staircase. 2. The elevator would be powered by photo cells that convert light into electricity. 3. With : photo CELL -PHONE-CARLO. 4. The earring is designed with a pulsed photo cell , a sensor and a light. 5. The photo cell 's output depends on the amount of light it receives through the atmosphere. 6. When the photo cell and sensor detect a heartbeat, they activate the light so it flashes for each throb. 7. The Flash-Matic used directional flashlight in the transmitter device, and photo cells in the television set itself. 8. This type of window helps to bundle the light coming from the direction in which the photo cell is pointed. 9. The optical part of such a meter is a window in front of the photo cell 's light-sensitive side. 10. Without sounding too technical, the Flashmatic operated using four photo cells , one in each corner of the TV cabinet around the screen.
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