Tate's Patent Arithmometer, b y C. & E. Layton, London, with sloping lacquered-brass face, two displays of nine and sixteen digits set from milled-brass knobs in hinged and sliding plate, eight sliding numeric cursors, two ebony-handled cranks and addition-multiplication / subtraction-division lever, in brass-bound mahogany case with handles and hinged lid, wd. 23 1/2 in., (lacquer rubbed in places). Note: The arithmometer, originally designed by Thomas de Colmar in 1820, was the first commercially-designed calculator capable of multiplication. In 1883 Tate began manufacturing Thomas de Colmar-type arithmometers in England; his patents were later acquired by C. & E. Layton, who incorporated further improvements.
Tate's Patent Arithmometer, b y C. & E. Layton, London, with sloping lacquered-brass face, two displays of nine and sixteen digits set from milled-brass knobs in hinged and sliding plate, eight sliding numeric cursors, two ebony-handled cranks and addition-multiplication / subtraction-division lever, in brass-bound mahogany case with handles and hinged lid, wd. 23 1/2 in., (lacquer rubbed in places). Note: The arithmometer, originally designed by Thomas de Colmar in 1820, was the first commercially-designed calculator capable of multiplication. In 1883 Tate began manufacturing Thomas de Colmar-type arithmometers in England; his patents were later acquired by C. & E. Layton, who incorporated further improvements.
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