Pendulum clock by D. Quare, London 1701
One of the older clocks used in the Bologna Specola, by Daniel Quare (1649-1724). It has inlaid wooden case, dial plate in silver and inlaid brass. The hours on the dial are in Roman numbers, the minu...
Plate measuring machine by Repsold & Sohne, used for the 1874 Dutch expedition at Reunion
This machine was taken on the 1874 expedition to Reunion With this machine the Dutch measured the glass photographic plates made with the photografic telescope.
Repsold & Sohne, Berlin, 1873
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.
Reflecting Telescope by James Short, London, c. 1761
This Gregorian reflecting telescope on an equatorial mounting was probably made especially for observing the 1761 transit. Its maker James Short specialised exclusively in the manufacture of reflector...
Refracting telescope by C.A. Steinheil, Munich 1856
The telescope in Muddapur, India, ready to be used by Pietro Tacchini (1838-1905). In 1874 he led an Italian expedition for the Venus transit. Although Bologna astronomers were not among the observers...
Refracting telescope by Josef Fraunhofer , used to observe the 1874 and 1882 transits (on the right)
This refracting telescope (Inventory-Number CIf10) was aquired by the Mathematisch-Physikalischer Salon (Dresden, Germany) from Bergrath Gehlen of Leipzig in 1823.
It was taken on German expedition...
Samuel Dunn's analysis of the 18th-century transits
In his "A Determination of the Exact Moments of Time" (London, 1770), Samuel Dunn provided this large folding plate to compare the appearances of Venus in transit in 1761 and 1769. He also tabulated t...