Six inch silver sector, late 18th century.

Made:
late 18th century in London
maker:
Jesse Ramsden

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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

Six inch silver sector signed "Ramsden, London" with attached set square, late 18th century. Sectors were used from the end of the 16th century until the mid 19th century for calculations involving proportion. They were ingraved with logarithmic and trigonometric lines, and lines for drawing and calculating surfaces and volumes.

Details

Category:
Mathematics
Object Number:
1971-82
Measurements:
overall (lying flat): 2.5 mm x 160 mm x 69 mm, .158 kg
type:
sector
credit:
Caiger, J.