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Burt's Slide Rule for reducing superficial measurements to inches

1887 patent

Burt's American Board Rule for superficial measurements

circa 1908

Burt's patent measuring and cubing slide rule

Slide rule for cubing and girthing

1887-1920
Book, "The Railway Rates Standard Timber Measurer" by E A P Burt, published by William Rider & Son, Timber Trades Journal Office, London, January 1888. Annotated: To His Grace The Duke of Richmond and Gordon KG, PC, with The Author's Compliments, 1891 3rd November.

Railway Rates Standard Timber Measurer Book

1888