This photocell is a mystery. The only identification is 405 and OR but this may not be the Type designation.![](../pics/acl0178a.jpg)
The construction is of a semi cylindrical photosensitive cathode and a ring anode in front.![](../pics/acl0178b.jpg)
The front view.![](../pics/acl0178c.jpg)
The top supports for both electrodes are fixed into a clear glass rod.The thin glass tube envelope is 15 mm in diameter and, excluding the base pins, is 48 mm tall.Reference: Observation. |
Updated September 14, 2020.
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