Equivalent Weight Calculator for Paper

Equivalent Weight Calculator for Paper

£80

Dimensions

15 inches

Circa

1918

Country of manufacture

UK and Ireland

Category: Calculating

Description

Ivorine on boxwood equivalent weight slide rule, for paper calculations allowing calculations in pounds for various imperial paper sizes, with gauge points Royal, double crown, Demy, double foolscap, and other paper sizes. In overall reasonable condition noting 3 small losses of ivorine at left end

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GB Fletcher

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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