Universal equinoctial ring sundial, London, c 1800.

Hills, Jennie

 
Universal equinoctial ring sundial, London, c 1800.
4 0 c m
 
31cm
actual image size: 23cm x 32cm

Description

Sundial, signed 'Cary, London'. To find the altitude of the Sun, the shadow of the pin was made to fall on the angle or 'nautical' scale on one side of the instrument. To find the time, the suspension ring was set at the latitude, the small index with the pinhole was moved to coincide with the date on the central bridge, and the point of light from the pinhole gave the time on the hour ring.

© Science Museum / Science & Society Picture Library

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