Magnetic azimuth dial for latitudes 47°-49° North. The outside of the lid carries a dial, with a date scale divided by month, for showing the length of the day. It has a silver index arm, a zodiac scale, a scale for showing daylight hours and the equinoxes are marked at 21½ March and 22 September. The inside of the lid carries a lunar volvelle.

The dial itself has a silver plate and a glass plate, held in place by a silver ring. Declination circles are drawn from Tropic to Tropic for the beginning of each sign. The centre of the plate is engraved with a hunting scene with a man and two dogs. Around this scene are the words 'Hora diel scitur ex gradu Solis Cum Stilis Vmbratus in lineam Sub Scriptam in Ciderit' (The hour of the day is found out from the position of the sun with the shadow of the style on the line engraved below).

A radial silver arm, engraved with a central line, is set on top of the glass plate. The rod that casts the shadow is hinged to this and folds flat when not in use. The dial is turned until the shadow cast by the sun lies along the line on the silver arm, at which point the compass needle will indicate the time. The lunar volvelle in the lid of the instrument allows the dial to be used at night as well as during the day. The dial-plate is signed 'Johannes Buschmann'.

For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.