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A Johann Martin silvered and gilt brass universal equinoctial crescent ial. German. circa 1710, signed Johann Martin In Augsburg, the base plate engraved with table of latitudes for 45 cities, silver latitude arc, hinged pierced gilt brass plate bearing two silver hour scales 12-10 & 12-2, sliding steel gnomon over silver calendrical scale, folding plumb-bob, two screw feet, the reverse with gilt brass and silver volvelle, 65mm x 70mm x 70mm Footnotes: Provenance Private Collection Johann Martin (1642-1721) initially worked as a clockmaker in Augsburg and also specialised in high quality portable sundials and in particular, he designed and made the crescent form of the equinoctial sundial. For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing
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A Johann Martin silvered and gilt brass universal equinoctial crescent ial. German. circa 1710, signed Johann Martin In Augsburg, the base plate engraved with table of latitudes for 45 cities, silver latitude arc, hinged pierced gilt brass plate bearing two silver hour scales 12-10 & 12-2, sliding steel gnomon over silver calendrical scale, folding plumb-bob, two screw feet, the reverse with gilt brass and silver volvelle, 65mm x 70mm x 70mm Footnotes: Provenance Private Collection Johann Martin (1642-1721) initially worked as a clockmaker in Augsburg and also specialised in high quality portable sundials and in particular, he designed and made the crescent form of the equinoctial sundial. For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing
Katalog
Stichworte: Sonnenuhr, Scale