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J. BIANCHETTI, CIRCA 1850
細節
A FRENCH CANNON DIAL
J. BIANCHETTI, CIRCA 1850
with noon-cannon and burning lens, quadrant arc with calendrical scale, two bubble levels, 8-point compass rose, bird gnomon for latitudes 40°-60°, two hour scales for 40° and 50°, signed on circumferential band J. Bianchetti Opticien Marseille.
3¼in. (8cm.)
J. BIANCHETTI, CIRCA 1850
with noon-cannon and burning lens, quadrant arc with calendrical scale, two bubble levels, 8-point compass rose, bird gnomon for latitudes 40°-60°, two hour scales for 40° and 50°, signed on circumferential band J. Bianchetti Opticien Marseille.
3¼in. (8cm.)