Nice, France
The 77 cm (30 in)
refractor telescope made by Henry and Gautier became operational around 1886–1887 was the largest in a privately funded observatory, and the first at such high altitude (325 m or 1,066 ft above sea level). It was slightly bigger in aperture, several metres longer, and located at a higher altitude than the new (1895) 76 cm (30 in) at
Pulkovo observatory in the
Russian Empire, and the 68 cm (27 in) at
Vienna Observatory (completed early 1880s). In the records for the largest refracting telescopes all three were outperformed by the 91 cm (36 in) refractor installed at the
Lick Observatory at 1,283 m altitude in 1889.
https://en.wikipedia.org/wiki/Nice_Observatory