Twelve-inch quadrant, c 1767.
4 0 c m
 
31cm
actual image size: 23cm x 32cm

Twelve-inch quadrant, c 1767.

© Science Museum / Science & Society Picture Library

Description

Quadrant made by John Bird, said to have been used by Captain James Cook (1728-1779). Astronomical quadrants were used to measure the angle of a celestial object from the zenith. Operated in conjunction with a transit instrument, they could be used to check the running rate of astronomical clocks known as regulators. At sea, a quadrant can be used to help fix a ships position and to determine latitude.
 

Image Ref.

10196289
 

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