B58-751
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Item no.: 161887392097
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B58-751 CYLINDRICAL SLIDE RULE. Thacher Patent. Invented by Edwin Thacher in 1871 and manufactured in the US by Keuffel & Esser (which usually misspelled it as "Thatcher.") Thacher's innovation was that by cutting the scales into segments and mounting them around the cylinder he was able to achieve the accuracy of a slide rule more than 60' long. Scales are in very clean condition, the base decal with instructions is almost intact and completely legible. 24" wide. No case. Fine 300-600
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