Universal equinoctial dial for latitudes 30°-65° North. Round silver watch-type case containing the silver dial which has a brass hour-circle and gnomon. The front and back of the case are engraved with laurel wreaths, within which is contained a table of latitudes comprising cities and tables in Europe, such as 'Ierusale (Jerusalem) 32', 'Madrit 41' and 'Stockh (Stockholm) 60'. The dial-plate is silver and engraved with leaves and has a circular pattern around the compass. The latitude scale is engraved on a small circle and divided anticlockwise. There is a rotatable index arm attached to the centre of this circle, which is linked to a cam and spring mechanism for setting the angle of the hour circle. The compass, also silver is set into the dial-plate. The cardinal points are marked in Latin initials and the magnetic variation is marked at 15° West of North. The needle is blued, in the form of an arrow and surmounted by a brass pyramidal pivot. There is a broken glass plate over all. The hour-circle is spring-loaded, hinged and made of gilt-brass with silver inset in its inner rim. It is engraved with hours and numbered clockwise 3-12, 1-9. A pivoted, turned gilt-brass strut across the East-West diameter supports the rod gnomon, which has a weight at one end.

This instrument is very similar to AST0405 by Hager. However, it covers a wider range of latitude and its table of latitude carries a much more extensive range of towns. It is signed 'Joha Martin: Aug: spurg 48'.

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