Circular slide rule, 1660-1680.
- maker:
- John Brown
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LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
License
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
- Measurements:
-
Overall: 155 mm x 155 mm x 20 mm, 150 mm, 0.175 kg
- type:
- circular slide rule
- credit:
- Weinreb, B.
