Pocket thingy

[celtex]

Not sure if temp gauge, barameter or altimeter? Face is evenly engraved (stamped) spring action. Brass construction and used to have a glass face that opened
Thanks for looking!
Favorite part of detecting is finding out what it is

 

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[Tpmetal]

Guage of some sort. That spiral tube flexes and slightly "unwinds" under pressure giving you the reading. Also could be from thermostat of some sort and they function on same principle.

 

[celtex]

Thermostat doesn't quite fit a pocket application does it? There isn't any contact points for wires that I can see.

 

[Esotericvalue]

My guess would be a pedometer

 

[celtex]

How would the "spirit coil" measure steps? and register progress? Don't think they had pedometers in 20s

 

[ticndig]

I think it's an early pocket game and compact mirror combo. still made today
the clues are the spring action and glass front. the game would have had little balls , you tilt to get all the balls into the center, open it up to see yourself while applying makeup.

 

[HuntinDog]

If it is a gage to measure pressures it looks like it would be a sensitive one.
The tube is small and light.
I don't see an attachment for a needle in the center, so that is interesting... Can you?
and I can't see the other end to see if it is open to the air.
how the gage would work..

The Bourdon tube is also an elastic-element type of pressure transducer. It is relatively cheap and is commonly used for measuring the gauge pressure of both gaseous and liquid fluids. It consists of a specially shaped piece of oval-section, flexible, metal tube that is

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fixed at one end and free to move at the other end. When pressure is applied at the open, fixed end of the tube, the oval cross-section becomes more circular. In consequence, there is a displacement of the free end of the tube. This displacement is measured by some form of displacement transducer, which is commonly a potentiometer.

Interesting find...

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[celtex]

The face was attached at the center of the coil but vinegar kind of dissolved the tiny bit that was still attached. The back is solid but it had a face plate no ports or contacts and the face has equally spaced etchings from center where it was attached to edge. Pocket something ?? lol The logo is small and I am trying to clean it a bit more to see if I can get a name.