Six inch silver sector, late 18th century.

Image number: 10328271

Six inch silver sector, late 18th century.

A sector with attached set square, made and signed by Jesse Ramsden, London. Sectors were used from the end of the 16th century until the mid 19th century for calculations involving proportion. They were engraved with logarithmic and trigonometric lines, and lines for drawing and calculating surfaces and volumes, all radial from the centre of the hinge.

Image number:
Science Museum/Science & Society Picture Library
Date taken:
21 October 2003 10:09
Image rights:
Science Museum

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