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Plotting protractor

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made in Edinburgh

Plotting protractor
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This brass plotting protractor was made around 1870 by Angus Henderson, a scientific instrument maker based in Edinburgh. It is used to divide the circle into sections.

The protractor has 400 'grades' or metric degrees, instead of being divided into 360 degrees. This aspect of metrification never became popular.

Angus Henderson began trading independently as a 'Practical Optician, Microscope, Mathematical and Philosophical Instrument maker' in Edinburgh's Hanover Street in 1861. He ceased to trade in 1884.

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