細節
A German ivory diptich sundial
Tüher family. Second quarter 17th Century
FACE 1a upper leaf, outer face: numbered 32-point wind rose with surrounding compass directions and pointing finger-shaped brass index, the surround with four wind-blowing faces and typical border decoration, with one of two brass hooks for holding open and compass viewing aperture; FACE 1b upper leaf, inner face: Two vertical pin gnomon dials for Babylonian and Italian hours, three string gnomon holes for latitudes 54°, 48° & 52°, table of altitudes for 21 European cities, floral and foliate decoration; FACE 11a lower leaf, inner face: The compass bowl with blued steel needle and brass cap, the case inscribed with OCCIDENS and ORIENS, S, M, a fleur-de-lys, arrow for magnetic deviation and two maker's marks in the form of a speckled snake, surrounded by three concentric hour scales for the three different latitude settings, with two scaphe dials for Italian and Babylonian hours, each with sun/moon face, with floral and foliate decoration, the side of the leaf with a space for the wind vane (cover missing), the front with two brass hooks; FACE 11b lower leaf, outer face: Brass volvelle with sunface, index and twice XII hours marked, lunar phase aperture, within concentric scales for twice XII hours, 1-29 lunar days and Julian and Gregorian epacts, the surround with four wind-blowing faces, border decoration and four small brass bun feet
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