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McFarlane calculating cylinder, 19th century.

Richardson, Claire

McFarlane calculating cylinder, 19th century.
3 4 c m
actual image size: 32cm x 26cm


A cylindrical form of slide rule made by McFarlane. Cylindrical slide rules, like circular versions of the instrument, were designed to get greater scale length than would be practical with a conventional slide rule. This enabled calculations to be made with greater accuracy than with a standard slide rule.

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© Science Museum / Science & Society Picture Library

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