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The CM17 photocell is probably an early design, based on the screw connector to the cathode. The cathode is a plate bent at 90 degrees and mounted so that the incident light hits the cathode at 45 degrees to each face. This structure increases the surface area of receptor for a given aperture size. The anode is a square of wire placed at the edges of the receptor aperture.
The classic envelope is 35 mm in diameter and, excluding the B4 base pins, is 95 mm tall.
Reference: Observation.


Updated April 23, 2013.
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