Rectangular protractor, late 18th century.

Rectangular protractor, late 18th century.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

A bras rectangular protractor, made by Dollond of London. As well as the usual angular scale the instrument contains a diagonal scale for plotting distances on a map or plan.

Image Details

Image Ref.
 
10328089

© Science Museum / Science & Society Picture Library

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