E.M. Scofield: The Engineers Slide Rule
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Description
The Engineers Slide Rule, made in USA by E. M. Scofield, Bridge Engineer, Youngstown, Ohio. Patent 1901-1902. Comprised of paper scales on boxwood. 24" L x 2" W x 1/2" D. Provenance: Private West Tennessee Collection. Note: According to the Smithsonian Museum of American History, which has an identical example in its collection, "Edson Mason Scofield (1867-1939) developed this rule in 1891 while he worked for Edwin Thacher (inventor of the cylindrical slide rule bearing his name). Thacher applied for a patent on the design in 1900 and assigned a half-interest to Scofield when the patent was issued in 1901. According to the instrument, Scofield may have distributed the rule himself."
Condition
Shows staining and toning due to age and use.
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E.M. Scofield: The Engineers Slide Rule
Estimate $400 - $450
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