The CMG7 is clearly a photocell and the screw top caps indicate that it was made in the early to mid 1930s. It has a B4 base cap that has the M-OV identification moulded into the underside. No operating details have yet been located.![](../pics/aaa1898a.jpg)
The light admitting window and the two screw cap connections. There are also two evacuation pips.![](../pics/aaa1898b.jpg)
This exhibit was kindly donated by Murasaki Neko in 2021.The wide glass tube envelope is 34 mm in diameter and, excluding the B4 base pins, is 142 mm tall.References: Observation. |
Updated October 29, 2021.
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