Movable quadrant by S. Menini - Bologna, 1710: brass and iron, radius 100 cm.
This instrument was used in Bologna by Eustachio Zanotti in order to take the positions of Venus on the Sun during the 1761 transit. It is fitted with two telescopes, one fixed the other movable. It h...
Quadrant by Georg Friedrich Brander, used for the 1761 transit by P. v. Osterwald
Deutsches Museum Munich
Sign.: "G.F. Brander fecit Agustuae Vindel. ACAD: SC: ELECT: BOICAE SOD:"
Made in 1760/61
Total Height: 245cm
The instrument was ordered by the Bavarian Aca...
Quadrant engraved "J. Bird, London," ca 1764.
Astronomical quadrant by Jeremiah Sisson of London ca. 1765.