Can you help identify this oldschool measuring/calibration instrument?

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Offline furtive_vole

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I'm hoping to identify the name and use of the instrument shown in the photos. Provenance unknown although came to my from my father (industrial designer) and possibly grandfather (engineer - marine and other).  The large calibrated vertical dial on the left links to the upward-facing display via a worm. The case contains (far right) an additional weight(?) with a flat-ended pin.

I appreciate that this forum many not be the best place for this post: if so could you point me in the right direction?  Many thanks.

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Offline Colin2B

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I think you might have a planimeter, a technical drawing or drafting instrument used to estimate area on a drawing. I think the 'weight' might be support for the fixed end but I'm not sure.
Fascinating item, does it say who made it?
and the misguided shall lead the gullible,
the feebleminded have inherited the earth.

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Offline Thebox

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It looks like some sort of router to me, to scribe out indentations and scrolls, weight defining the depth of scroll.

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Offline Colin2B

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It looks like some sort of router to me, to scribe out indentations and scrolls, weight defining the depth of scroll.
I must admit when I first saw it I thought scriber, perhaps for arcs. But I couldn't make sense of the wheel and scale until I stopped thinking of that as an adjuster and looked at it as a measuring device.
and the misguided shall lead the gullible,
the feebleminded have inherited the earth.

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Offline Bored chemist

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I agree with colin2B

It looks very much like one of these
https://en.wikipedia.org/wiki/Planimeter
Please disregard all previous signatures.

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Offline furtive_vole

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Thanks to everyone who has replied.  The planimeter certainly looks a close match.

Though not obvious from the photos, the sharpest of the 'points' seems suited to anchoring rather then scribing or routing ... there's no ready means of holding, say, a pencil lead or a cutting device.

There's a maker's (rather than owner's) name at the far end of the free arm, but it's in script and was illegible / unrecognisible. Having checked out ebay however, it's coming up as an Amsler, Jacob Amsler being a 19th century Swiss mathematician and instrument-maker.

Many thanks again - learned something today!