Circular slide rule, 1660-1680.

Made:
1660-1680 in England
maker:
John Brown
Circular slide rule, 1660-1680. (circular slide rule) Circular slide rule, 1660-1680. (circular slide rule)

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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

Circular slide rule, boxwood, 6-inch diameter 3/8-inch thick, with two brass radial arms and an astronomical quadrant engraved on the back, ascribed to John Brown

A circular slide rule, made by John Brown, with two brass radial arms and an stronomical quadrant engraved on the back. A spiral slide rule affords a long and therefore accurate logarithmic line in a small amount of space. The potential of spiral rules was not really utilized until the Victorian period, when several spiral and helical designs appeared on the market.

Details

Category:
Mathematics
Object Number:
1954-433
Materials:
boxwood, brass and complete
Measurements:
Overall: 155 mm x 155 mm x 20 mm, 150 mm, 0.175 kg
type:
circular slide rule
credit:
Weinreb, B.