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identification of strange compass

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Watford29/07/2017 21:40:30
126 forum posts
11 photos

Found this strange compass in an autojumble a while back, for a quid.

Strange in that it is scaled 0-90-0-90 rather than 0-90-180-270.

Suspect that it came from some piece of surveying equipment but do not know what. I would love to know. Any suggestions.

Thanks in anticipation. frown



Swarf, Mostly!29/07/2017 22:36:13
527 forum posts
47 photos

Hi there, Mike,

Your device is the indicator from a tangent galvanometer.

I remember using one during physics lessons at school but that was a long, long time ago!

I suggest you Google 'tangent galvanometer'.

Best regards,

Swarf, Mostly!

Watford30/07/2017 10:26:13
126 forum posts
11 photos

Thanks Swarf.smiley You are a star.

I was off down completely the wrong path, it is good to know what it is at last. I saw it on a stall at an autojumble and it looked a 'very nice' thing; particularly for a single pound! I cleaned it up - it was pretty grotty - and have wondered ever since.


Russell Eberhardt30/07/2017 11:57:26
2573 forum posts
85 photos

You just need to find the coil now smiley


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