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Diptych dial for latitude 49� North. This octagonal dial consists of two leaves that fold flat when not in use. Leaf Ia displays a standard lunar volvelle (see related terms) except there is no scalloped edge to the brass disc. The remainder of the leaf is occupied with foliate decoration and there is a single-lined border. Leaf Ib has a vertical dial with blue hour-lines radiating from a central sunface. Various decorative motifs adorn the leaf which also has a double-lined blue border. The string gnomon for use with the vertical dial is missing.
Leaf IIa features a compass surrounded by a double-lined blue border. It is marked with the cardinal points in Latin and is offset 2� East of North to allow for magnetic variation. The needle is in the form of an arrow and surmounted by a brass pyramidal pivot. The glass plate is held in place by a brass ring. The Southern part of the leaf carries a horizontal dial for Italian hours with a brass gnomon. On display are various motifs and there is also a double-lined blue border. Leaf IIb is blank except for Miller's makers mark - a crown. The leaves have a brass hook fastener and a brass hook for holding the dial open. The octagonal shape of this dial is unusual, but it does occur on other dials of Nicolaus Miller (see Lloyd [1992], pp. 75-6, nos 24 and 25).
For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.
caption: Diptych dial, leaves Ib and IIa
caption: unavailable
caption: Diptych dial, leaf Ia | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Diptych dial diptych dials Nicolaus Sundials at Greenwich Miller | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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