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Rule (detail)

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probably made in London

Rule (detail)
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This is a detail of a brass rule made around 1750, probably by Jonathon Sisson of London. It was owned by William Galbraith (1786-1850), an early-19th-century Edinburgh teacher of Mathematics.

This detail shows the inscription at the end of the rule. It reads 'William Galbraith / Edinr.' Galbraith made an accurate survey of the west coast of Scotland, and lobbied for the trigonometrical survey to be resumed. He taught mathematics, natural philosophy and navigation between 1819 and 1845.

After the death of William Galbraith, the rule was in the personal possession of J. D. Forbes, Professor of Natural Philosophy at the University of Edinburgh.

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