Hadley's quadrant, 12 inch with back sight, early 19th century.
4 0 c m
 
31cm
actual image size: 23cm x 32cm

Hadley's quadrant, 12 inch with back sight, early 19th century.

Fernandes, Iris

© Science Museum / Science & Society Picture Library

Description

Navigational instrument made by Spencer, Browning and Rust. In 1716, John Hadley (1682-1744) became a Fellow of the Royal Society and was appointed vice-president in 1728. In 1730, he invented a quadrant which worked on a double-reflecting principle allowing an accurate measurement of the altitude of stars and the Sun. This instrument was the precursor of the sextant.
 

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Image Ref.

10438278
 

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