Augsburg dial

Augsburg dial for latitudes 10°-90° North. Standard dial (see related terms) except for the following details:-

It has a square dial-plate. The compass has a central four-pointed star and the magnetic variation is indicated at 21° West of North. Around the compass is an engraved circle decorated with leaves and the remainder of the dial-plate consists of open-work leaf motifs. The latitude arc is divided 10°-9[0°] and the hour ring is cusped. Hinged to the South side of the dial-plate, the plumb-bob support is elaborately shaped, engraved with foliate decoration and pierced to accommodate the plumb bob. The brace for the plumb-bob support on the underside is shaped and decorated with a leaf motif.

The plate is supported by three brass legs, one of which is fixed, the other two being able to act as levelling screws. The base of the compass is decorated with a ring of engraved leaves around the signature, 'Johan Schrettegger in Augsburg', and there is no table of latitudes. Like AST0284, this dial is square, which is unusual for an Augsburg dial. There are other differences from the norm, including the open-work that surrounds the compass well, the cusped hour ring and the lack of a table of latitudes.

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

Object Details

ID: AST0316
Collection: Astronomical and navigational instruments
Type: Augsburg dial
Display location: Not on display
Creator: Schrettegger, Johann Nepomuk
Date made: 1800-1843; 1800-43
Credit: National Maritime Museum, Greenwich, London, Caird Collection
Measurements: Overall: 18 x 83.5 x 83.5 mm
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