Diptych dial, leaf Ia
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| Depth | cm (in) |
| Artwork | x cm ( x in) |
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Diptych dial, leaf Ia
Diptych dial for latitude 49 north. This is a miniature diptych dial consisting of two leaves that fold flat when not in use. Leaf I is made of ivory and leaf II has a wooden core sandwiched between the ivory. Leaf Ia features a lunar volvelle. Leaf Ib contains the vertical dial with hour-lines radiating from a double semicircle. Leaf IIa displays a compass with the hours for the horizontal dial set around it. The hour-lines radiate from the string gnomon. This is for latitude 50 and is attached between the inner surfaces of the two leaves. The compass has the cardinal points marked in Latin and is offset 20 west of north to allow for magnetic variation.
- Image reference: F2057-2
- National Maritime Museum, Greenwich, London
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