Rare “Universale” slide rule Pencil

Rare “Universale” slide rule Pencil



6 inches



Category: Calculating


Rare “Universale” slide rule pencil, cursor on clip. Conventional logarithmic scales. Marked DRPa Auslandspatente a, and USA Patent No.1599102 and Brit Pat. No. 259112.

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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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