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jake_crew

Any idea what this instrument is ?

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3 minutes ago, jake_crew said:

A mapping tool perhaps ?

EE7ZEJeXUAEClVr.jpg

Gilbert's were optical instrument makers,lens angle caliper?That's my sixpennorth!😎😎

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2 minutes ago, Alan de Enfield said:

It is a folding 12" ruler.

If so, what would the L, S and C scales mean ?

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It's a Sector, also known as a Proportional Compass.

 

Edited by Tom Morgan
Edit - to remove an alternative name which might cause confusion.
  • Greenie 1

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Thanks Hudds - that quite a comprehensive document !

 

Thanks Dorian - thats a great link.

 

The info is for my daughter, she works at the Leeds Museum of Science and found the device in their archives.

  • Greenie 1

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