Arithmetical Jewel, 1619.

Made:
c. 1619 in England

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Arithmetical Jewel : a seventeenth century calculating device of ivory and brass in tooled leather binding, 5" x 3", with brass stylus 5 inches long, bound with 33 sheets of contemporary MS instructions and 7 blank sheets

The 'Arithmetical Jewel' publicised by William Pratt in 1619. This instrument combines features of an abacus with those of pen reckoning. Numbers are put in by moving the flags to reveal dots. Sums are then worked out with a pen and paper.

Details

Category:
Mathematics
Object Number:
1952-206
Materials:
brass (copper, zinc alloy), ivory, leather, paper (fibre product) and velvet
Measurements:
Open: 75 mm x 272 mm x 26 mm, 0.14 kg
Closed: 130 mm x 135 mm x 26 mm, 0.14 kg
type:
abacus
credit:
Weil, E.