|
Date: |
|
Description: | Equinoctial dial for latitude 30� North. This dial has a shaped brass base with three flower-headed levelling screws. At the centre of the base is a support for the vertical circle segment. At the North end of this, an equinoctial hour dial is held against the ring by a screw on which the numbers for every other hour are engraved in red. A screw on the South of the segment supports a horizontal compass. This has a white base marked with a red meridian line and a blued needle surmounted by a brass pyramidal pivot. A glass plate covers all. A screw at the top point of the segment supports a string plumb line and a brass plumb bob suspended over a brass pillar. A screw also supports the string gnomon which is perpendicular to the dial-plate.
This unusual form of equinoctial dial shows clear Western influence, as opposed to the 'pseudo-equinoctial' boxwood dials such as AST0378, AST0426 and AST0428.
For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.
caption: Equinoctial dial | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | equinoctial dials Directional dial Sundials at Greenwich Equinoctial dial Treasures of the National Maritime Museum | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
|
|