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NICHOLAS BION, EARLY 18TH CENTURY
細節
Declinatory construction and horizontal dial
Nicholas Bion, early 18th century
signed on the square plate N Bion AParis, degree scale 90°-0°-90° divided by 1°, top edge inscribed coste applique AU MUR, the rotating horizontal dial with four hour scales for 40°,45°,50° and 55° of latitude, marked in roman and arabic numerals for 4-12-8, shaped and graduated bird gnomon, with glazed eight-point compass rose.
5in. (12.5cm.) wide
Nicholas Bion, early 18th century
signed on the square plate N Bion AParis, degree scale 90°-0°-90° divided by 1°, top edge inscribed coste applique AU MUR, the rotating horizontal dial with four hour scales for 40°,45°,50° and 55° of latitude, marked in roman and arabic numerals for 4-12-8, shaped and graduated bird gnomon, with glazed eight-point compass rose.
5in. (12.5cm.) wide
出版
cf. AST1150 in Higton, H. Sundials at Greenwich. (Oxford: 2002), pp.334-5, a similar construction dial by Desfontaines