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JOHANN MARTIN, CIRCA 1700
细节
A UNIVERSAL EQUINOCTIAL CRESCENT DIAL
JOHANN MARTIN, CIRCA 1700
signed on the gilt brass plate Johann Martin 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, in original gilt-tooled leather case
2½in. (6cm.) long
JOHANN MARTIN, CIRCA 1700
signed on the gilt brass plate Johann Martin 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, in original gilt-tooled leather case
2½in. (6cm.) long