This exhibit is marked on the glass as a glowswitch and Made in England. The voltage rating on the base is 230 - 250 Volts.Inside are two vertical plates with a wire from one that approaches the other. The design looks to be that at a given voltage the small gap will break down causing ionisation of the gas filling and thus triggering a larger current flow between the main plates.It is possible that this would have been used as a low power glow modulator.![](../pics/abu0016a.jpg)
The glowswitch is fitted with a small bayonet base.![](../pics/abu0016b.jpg)
The plates are in alignment.![](../pics/abu0016c.jpg)
Here the trigger electrodes can be seen above the main plates.The thin glass tube envelope is 20 mm in diameter, and including the bayonet base is 76 mm tall.Reference: Observation. |
Updated October 28, 2015.
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