An Example of very rare Fearnley Universal Calculator

An Example of very rare Fearnley Universal Calculator



42 cms

Country of manufacture

UK and Ireland

Categories: Scientific, Calculating


An example of a very rare Fearnley Patent Universal calculator, marked ‘By Royal Letters Patent’-in original mahogany case.

Modus operandi is not clear although the Science Museum example describes its use by the Observatory of Cambridge University.

There are no moving parts or cursor-The calculator is rather grubby as shown and the surface is covered throughout with uneven varnish.


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Fletcher Wallis

Fletcher Wallis sells objects and books relating to the history of science, medicine and technology from his unit at Admiral Vernon Arcade Portobello Road. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for thirty five years.

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