GF1photoelectric cell. Gas-filled type made by General Electric, England, circa 1928.
Introduced by Otto Pressler of Leipzig.
Anode is a ring carrying an open gauze, cathode is potassium deposited on a silver coating on the glass and sensitised with hydrogen. Gas (helium) is at 0.75 mm Hg.

Physical Description

Hemispherical bulb with side arm carrying one cap, two exhaust tips and second side cap carrying cathode connection. Light sensitive section is coated with Potassium

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