A spherical skeleton clock designed to represent the terrestrial globe by Henry Gratte, London c.1800, once belonging to the Astronomer Royal, Sir Harold Spencer Jones.

The spherical skeleton movement is supported on a brass pillar provided with three folding legs. Degrees of longitude are marked around the horizon of the globe. The time is shown in hours and minutes by means of two revolving bands which are read against a fixed red glass sun, the minutes being indicated on the upper band and hours on the lower. The horizontal dial is calibrated in four sections of 0° to 90° and the cardinal points S, E, and W are also shown (N missing).

The movement has a verge escapement (possibly later), fusee, pendulum and hour-striking on bell. Signed 'Henricus Gratte, invenit & fecit Londini'. Also with custom made winding key.

This clock belonged to the Astronomer Royal, Harold Spencer Jones, and was presented by his wife to the Worshipful Company of Clockmakers in 1961. Clockmakers' Museum No. 571