Hannyngton Extended Slide Rule

Hannyngton Extended Slide Rule




Country of manufacture

UK and Ireland

Category: Calculating


An example of Major General Hannyngton’s extended slide rule allowing for more accurate calculations. Made by Aston and Mander.

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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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