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Selenium photocell.

Selenium photocell.
3 5 c m
actual image size: 32cm x 27cm


This type of photocell operate acording to the photovoltaic effect. It is a metal disc coated with selenium on which is placed a layer of gold or platinum thin enough to transmit light. When light falls on the disc a small current is generated, indicating the intensity of light that is falling on the cell. They are commonly used in camera exposure meters. Made by Megatron.

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© Science Museum / Science & Society Picture Library

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