Can you identify this instrument
Join Date: Mar 2001
Location: uk
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That's odd - no picture in Post 1, just a little black box
The little arrow above the 5T looks like an "HMG property" symbol - I have the same on the back of my wristwatch 
Are there any connections or markings on the reverse? What's the diameter, roughly.
Whatever it is, the thing that I find most curious is the port/stbd asymmetry.
Incidentally, I'd be willing to bet that if you put a Geiger Counter to it, you may find it's fairly radioactive. Not because it's from a reactor, but because it looks like it may have used quite a lot of tritium or uranium based "glow in the dark" paint which was quite common for some years.
G
Are there any connections or markings on the reverse? What's the diameter, roughly.
Whatever it is, the thing that I find most curious is the port/stbd asymmetry.
Incidentally, I'd be willing to bet that if you put a Geiger Counter to it, you may find it's fairly radioactive. Not because it's from a reactor, but because it looks like it may have used quite a lot of tritium or uranium based "glow in the dark" paint which was quite common for some years.
G
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Whatever it is, the thing that I find most curious is the port/stbd asymmetry.
2 days after giving a talk on Radio Navigation equipment, I was asked what this is!
My guess it that it has something to do with mooring airships.
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By no means the same but it looks very much like a "gun fire arc" limiter thing I once saw inside a ships gun turret, the fellow showing us around if I remember correctly said it was to prevent self inflicted damage in the event that the automatic interupter systems failed, however if memory serves me right it was a bloody great brass thingy with similar markings on it, but it was long ago and the ship {boat?} had been laid up since the end of the war.
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If it is WW II or earlier then it likely has a Radium painted dial. IIRC a 26,000 year half life. Tritium was used post WW II most likely starting in the early 1950's.
Hugh, retired Nuclear Safety guy who had the dubious experience of mapping the Radium contamination of the Elgin clock factories in northern Illinois. This was one of the places that the Radium Girls worked painting clock, watch and instrument faces..
Hugh, retired Nuclear Safety guy who had the dubious experience of mapping the Radium contamination of the Elgin clock factories in northern Illinois. This was one of the places that the Radium Girls worked painting clock, watch and instrument faces..