Samuel Dunn's drawing of Venus in contact with the sun in 1769
A detail from the large plate which appeared in Samuel Dunn's "A Determination of the Exact Moments of Time" (London, 1770). Dunn attempts to record exactly the appearance of Venus when in contact wit...
Sidereal clock (regulator) marked "E. Howard & Co., Boston".
This was one of eight precise sidereal clocks made for the American Transit of Venus expeditions of 1874. It was also used by Albert Mi...
Spectroscopic images from the Italian transit expedition to India, 1874
The Italian astronomer Pietro Tacchini included spectroscopy as part of the observational programme of the expedition at Muddapur, India in 1874. This plate of coloured lithographic images comes from ...
Reflecting telescope with heliometer engraved "James Short London," ca 1763. Gift of Nathaniel Sparhawk as donor for William Pepperell in 1769.
Cassegrain reflecting telescope by James Short ca. 1758. Personal property of John Winthrop.
The Yale Heliometer manufactured by Repsold in 1882 for viewing Transit of Venus in December 1882.
The Yale heliometer arrived from the Repsold workshop in May 1882 just in time for the December transit of Venus. The heliometer was installed in the west tower of the newly built Winchester Observato...
Equal altitude (transit) instrument by John Bird, London, ca. 1767.
Taken to Newfoundland in 1769 by John Winthrop to observe the transit of Venus.
"Broken" transit instrument, made in New York by Stackpole & Brother. Transferred from the U.S. Naval Observatory.
This is one of eight identical instruments built for the United States' expedition...
"Broken" transit instrument, made by Stackpole and Brother of New York. Transferred from the U.S. Naval Observatory.
This is one of eight identical instruments that the Stackpole firm built for the...