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Rule

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probably made in London

Rule
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This brass rule (pictured here it its fitted case) was 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 side of the rule is engraved 'J. Sifson / LONDON' and 'William Galbraith / Edinr.' It also contains some of the scales first published by Edmund Gunther in 1624 which were developed to aid easy computation, particularly by navigators, and used well into the 19th century.

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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