Dieppe magnetic azimuth dial for 50° North (0°-80° North for equinoctial dial). Standard Dieppe magnetic azimuth dial (see related terms) except for the following details:-

The dial is split into four leaves. Leaf Ia comprises an equinoctial dial and a polar dial whose scales are edged on both sides by typical Dieppe 'pecked' ornamentation. Leaf Ib features a lunar volvelle of silvered brass (much of the silvering has worn away) consisting of a fixed disc and two rotatable discs with pointers. Leaf IIa contains a horizontal dial and a magnetic azimuth dial. The horizontal hour scale is marked around the edge of the compass bowl. A black string gnomon is set for a latitude of 50° and is attached between the two leaves for use with the horizontal dial.

There is a silvered brass elliptical scale in the base of the compass bowl for the magnetic azimuth dial. The cardinal points are named in Latin on the compass and there is a gazetteer for 19 French towns. The (replacement) needle is made of steel, is in the form of an arrow and is covered by a cracked glass plate. On leaf IIb is a date scale divided to month, in French. A slot in the left-hand side of the lower leaf contains a silver pin gnomon for use with the equinoctial dial. It is held in place by a pewter hook fastener. It is unusual for this pin gnomon to have survived. Apart from the different ornamentation, this dial is very similar to AST0362.

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