Together with many of the other Transit of Venus instruments, including all five of the other 6-inch equatorials, the Corbett was formally transferred to the Royal Observatory in 1876. In 1881, in preparation for the 1882 Transit, the Corbett was adapted for use on the superior equatorial mounting on one of the Dalmeyer Photoheliographs and erected for trial in the South Ground. The telescope was subsequently shipped to Madagascar for the Transit which took place on 6 December and where the observer is thought to have been Sidgreaves. It was returned to Greenwich on 31 January 1883 (RGO6/283/450 & 461).
In January 1887, the Corbett refractor was attached in the fairly recently acquired Lassell Equatorial for use both as a guiding telescope and for the observation of occasional phenomena. It remained there until November 1891 when its place was taken by the newly acquired Thompson Photoheliograph. It was transferred to its current location as the guiding telescope of the newly completed 28-inch Refractor in 1893. Originally mounted above the main telescope tube, it is thought to have been moved to its present position below it in 1920.
The mounting (or parts of it) are known to have been lent for at least three different eclipse expeditions:
In the 1893 inventory (RGO7/67), the stand is listed as being in two cases in the workshop in the basement of the New Physical Building (South Building). No mention of either the stand or mounting has been found in the three inventories compiled between 1911 and 1933 (RGO39/4, 39/5 & 39/6), suggesting that they were probably disposed of at some point before Christie retired as Astronomer Royal in 1910.
Account of observations of the Transit of Venus, 1874, December 8, made under the authority of the British government: and of the reduction of the observations. Edited by Sir George Biddell Airy, (HMSO, 1881)
Transit of Venus, 1882. Report of the Committee appointed by the British government to superintend thearrangements to be made for the sending of expeditions at the government expense, and securing co-operation with the government expeditions for the observation of the Transit of Venus, 1882, December 6. (HMSO, 1887)
The image of the Corbett Equatorial in the Transit of Venus hut at Greenwich is reproduced in compressed and slightly cropped form under the terms of a Creative Commons Attribution-NonCommercial 3.0 Unported License courtesy of Cambridge Digital Library (RGO6/276).