An intriguing hand-held analytical calculating apparatus, English, circa 1890,
comprising main brass core bar with bridged reading scale incised with Roman numerals up to XVIII, the 18 boxwood discs stamped ordering from 2 to 9, each with locking pin-face to engage with neighbouring disk, constant sprung-loading pressure from slot in the core - 4.3/8in. (11cm) long, each disc diameter .13/16in. (2.1cm)
Sold for
£312
inc. premium
Category: Collectibles / Scientific Instruments
Auction terms and conditions
Contacts
Jon Baddeley
Bonhams
Work
Montpelier Street
London,
SW7 1HH
United Kingdom
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0207 393 3872
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Specialist
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Scientific Instruments