It is obviously made to fit in a coat pocket along with pens. What happens at the buisiness end when the scale is moved?

The scale on it is non-linear (perhaps logarithmic), so that eliminates a vast amount of possible applications and opens up other possibilities.

I wonder if the scale is logarithmic, it is clearly not a linear scale but I wonder if it is a sine/cosine/tangent curve. Is there a spring in the tool?

Martin C

If you add 60 to each scale point you get close to a logarithmic progression. The deviation may be due to small errors in the numbers for the scale due to it being measured from a photo.

Martin C

The non-linear scale implies the gauge is for measuring intensity rather than a physical dimension, and the peep hole and squared top suggest a simple optical assembly is missing.

As the instrument is a pocket tool, it's used by someone walking about. The peep hole suggests she eyeballs the target. Sound and light, hence heat, are perceived by humans on a logarithmic scale. I think it's for judging the temperature of a furnace or flame for making glass, normalising steel, welding, or melting without boiling etc. Possibly confirming a lighting system is performing to specification.

Any sign of anything mechanical missing at the top? If it's a visual intensity gauge I'd expect the control wheel to adjust an aperture between the peep hole and the lens carrier, now lost.

Dave

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I would love to explore it further, Martin

MichaelG.

SOD,

I was speculating that the square held the base of a tool that was snapped into place into your 'aperture'. Something like fixed and sprung divider arms as a quick sizing of some tiny items for consistency…
The attachment would be kept in a separate pouch.
But since evidently the arms are easily bent it's an odd choice of design for any real accuracy.

pgk

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Sorry Steve,but it has to be said :

I am sick of people assuming that I just 'Google' everything.

What I wrote was :

"I would love to explore it further"

… and you will see that I have already put quite a lot into the exploration.

PLEASE just give it a rest

MichaelG.

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O.K. Steve … let’s just say your comment touched a raw nerve.

MichaelG.

That would be a quartz fibre dosimetry, getting to be old hat when I was regularly visiting Sellafield, and that's a fair few years back. It's all done electronically now. I only had one scary moment, alarm went off continuous rather than the occasional beep. Turned out the battery was nearly flat. I don't glow in the dark

Edited By duncan webster on 15/08/2021 00:59:08