| 1. | He placed infrared photo cells at intervals on a staircase.
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| 2. | The elevator would be powered by photo cells that convert light into electricity.
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| 3. | With : photo CELL-PHONE-CARLO.
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| 4. | The earring is designed with a pulsed photo cell, a sensor and a light.
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| 5. | The photo cell's output depends on the amount of light it receives through the atmosphere.
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| 6. | When the photo cell and sensor detect a heartbeat, they activate the light so it flashes for each throb.
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| 7. | The Flash-Matic used directional flashlight in the transmitter device, and photo cells in the television set itself.
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| 8. | This type of window helps to bundle the light coming from the direction in which the photo cell is pointed.
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| 9. | The optical part of such a meter is a window in front of the photo cell's light-sensitive side.
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| 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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