Gunner's quadrant with mahogany case

Made:: London

maker:: J Jackson

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License

This image is released under a CC BY-NC-SA 4.0 Licence

License this image for commercial use at Science and Society Picture Library

License

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

Gunner's quadrant with mahogany case.

Details

Category:: King George III

Object Number:: 1927-1785

Materials:: brass, glass, spirit, mahogany and baize

Measurements:: length 435 mm
width 178 mm
depth 26 mm
box: length 485 mm
box: width 210 mm
box: height 60 mm

type:: quadrant

credit:: King’s College London

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Parts

Gunner's quadrant

This instrument consists of a quadrant on a heavy brass arm of square cross section. It was placed inside the mouth of a cannon, the moveable arm carrying the spirit level was set to the horizontal, and the elevation of the cannon was read on the scale. It has a vernier scale which allows an accuracy of five minutes of arc.