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ENGLISH, 18TH CENTURY
细节
A 2½-INCH EQUINOCTIAL RING DIAL
ENGLISH, 18TH CENTURY
the brass dial composed of chapter ring with hours I-XII-I-XII , equinoctial ring with degree scale 90-0-80° and declination scale to reverse, the bridge with sliding pinhole gnomon on calendrical scales.
2½in. (6.5cm.) diameter
ENGLISH, 18TH CENTURY
the brass dial composed of chapter ring with hours I-XII-I-XII , equinoctial ring with degree scale 90-0-80° and declination scale to reverse, the bridge with sliding pinhole gnomon on calendrical scales.
2½in. (6.5cm.) diameter