Object Image

Astronomical regulator

This clock was used as The Sidereal Standard at the Royal Observatory, Greenwich for over 50 years until it was superseded in 1922 by the Cottingham-Riefler. It has a highly sophisticated detached detent escapement designed by the seventh Astronomer Royal, Sir George Airy. One of the first of its type, the pendulum compensates for temperature and barometric pressure changes. The present glazed hood and door were replacements made for the clock when it was exhibited at the 1951 Festival of Britain.

The four-wheel movement is enclosed by substantial rectangular plates, united by stout cylindrical pillars, and is mounted to a substantial cast bronze bracket. The great wheel has seven crossings an...

1600.0 x 435.0 x 243.0 mm
Image and text © Royal Museums Greenwich, 2021

Where you'll find this

The Royal Observatory
Permanent collection