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ID = 30920
Tube type:  ANY OTHER - NOT A TUBE, general 
Identical to St57

Filament Direct
Description This Robert Hermeyer device has the characteristics of a small mercury-in-glass thermostat with two detection points. It also has a heater in the mercury pool.
The exact purpose of this device is not yet known, but it has been recognized as being part of the Wandel & Goltermann PSM-5.
(It could be used as a true power detector by using it in a temperature controlled environment detecting the power required to maintain the mercury between the two set points, and/or as a precision thermostat.) 
Information source -- Collector info (Sammler)   
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St57: Private collection
Emilio Ciardiello

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