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Exhibition 'Marvellous Invention: Four Hundred Years of Logarithms' (August - October 2014) - circular slide rule

Circular Slide Rule

Until electronic pocket calculators nothing could oust the straight slide rule as the iconic instrument of mathematics. But the circular format, revived in the 20th century, also became very popular.

Plastic, chrome, and steel circular slide rule marked ‘Fowler’s Patent Long Scale Calculator “Magnum” Fowler & Co. Manchester’, in sturdy leather pouch, mid 20th century.

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