Unusual Go-No Go Tool?

Hi all,

This little item was in the bottom of a crate of tooling we just got, I think it is incomplete but would love to know its specific use? Turning the end moves the pointer along the scale marked "Micrographs"

Cheers, Martin

I wonder if ‘Micrographs’ might be the manufacturer, rather than the scale.

MichaelG.

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

Nothing seems to happe when the end cap is turned, as I said it looks incomplete?

Martin

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

Almost looks like some sort of sighting/viewing device on top. Look through the small hole and align something within the rectangular part?

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

Here’s a first stab at calibrating that scale

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Now you can all try curve-fitting, whilst I go out for the day

MichaelG.

Edited By Michael Gilligan on 13/08/2021 09:01:01

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

All waaay over my head! !

Are we saying that the tool might be complete?

Martin

No spring that i can see but there does appear to be a kind of small window by the clip and as one winds the end knob a sloping point moves back and forth in the window. window is quite murky and discolored so not easy to see.

Hers a pretty ropy pic:

With considerably less confidence … I have inserted values for most of the sub-divisions

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If anyone wants to play; please feel free to offer corrections and/or curve-fitting

MichaelG.

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Edit: __ This looks pretty good to me; but I still don't know what it’s for  

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Edited By Michael Gilligan on 13/08/2021 22:24:22

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

Hi All,

Thanks for the helpful comments.

Does anyone want it? FOC and free postage!

Cheers, Martin

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I would love to explore it further, Martin

MichaelG.

Hi Michael,

It will be in the post to you on Monday morning. Please email me your address again as I seem to have mislaid it!

Cheers, Martin

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

Never mind. I am sure Michael will google it to death & surprise us all with it's use. Mnn.???.

Steve.

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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.

Michael you have taken my post completely out of context. I was praising you for finding things that we rarely do. I always read your posts with great interest. If i seemed to offend it was not meant that way.

Steve.