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This is a very strange device. We have no idea what it is or what it was designed to do. It has two sets of contacts that form a SPST switch. The presumption is that the centre cylinder is heated and switches over the external circuit.
The wide glass tube envelope is 36 mm in diameter and, excluding the base pins, is 115 mm tall.
Reference: Observation.

 

Updated February 21, 2014.
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