SHEPPARD’S PATENTED DOUBLE-SLIDE SLIDE RULE

SHEPPARD’S PATENTED DOUBLE-SLIDE SLIDE RULE

Stock Number: 9342

$1150.

For sale, an antique boxwood slide rule, designed for volumetric computation. Made in England by Stanley.

Dimensions

13 inches (33 cm) overall

Circa

c. 1880

Country of manufacture

UK and Ireland

Categories: Scientific, Calculating

Description

SHEPPARD’S PATENTED DOUBLE-SLIDE SLIDE RULE, English, c. 1880, signed for the maker “Stanley Great Turnstile Holborn London,” for the inventor “Fred’k. A. Sheppard Patentee No. 160,” and for the owner “Claude W. Atkinson.” Constructed of fine boxwood, 13″ (33 cm) overall, the rule has two two-sided slides running alongside each other. In the simple mode for volumetric calculations, the upper fixed scale “Length,” the two sliding scales (“Breadth” and “Thickness”), and the lower fixed scale “Cubic Content” all have identical logarithmic divisions. To find the volume of a rectangular parcel, for example, one sets up the three dimensions and sees the answer immediately. To the reverse of the sliders are scales of square roots and linear scales of numbers. One edge of the rule has an applied (later?) paper scale of sines. We note a discussion of the relative merits of Sheppard’s rule versus one of Dring and Fage, published in the 1883 English Mechanic and World of Science. An uncommon rule, in very fine condition throughout.

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US TESSERACT

David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at [email protected]

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