Tuesday, 22 July 2025

A little ramble through 19th century astronomy - The 24 inch Grubb telescope for the Cape of Good Hope Observatory in South Africa

Mr. Frank McClean has expressed his desire to present a large equatorially mounted telescope, equipped for photographic and spectroscopic work, to the Royal Observatory at the Cape of Good Hope in 1894.

With this object he has arranged with Sir Howard Grubb, for the construction of a photographic refracting telescope of 24 inches aperture, and for an object glass prism to work with it, having a refracting angle of 7 degrees and the same aperture as the object-glass. The glass for the object glass and prism have already been secured, and the definitive order for the instrument was given to Sir Howard Grubb on May 4 last.

Coupled with the photographic telescope, there is to be a visual refracting telescope of 18 inches aperture. The mounting is to be sufficiently elevated to allow a slit spectroscope, for the determination of stellar motions in the line of sight, to be attached to the photographic telescope; and the gift will include such a spectroscope, as well as an observatory of light construction.

Although completed in 1898 it was not officially opened until 1901 and the telescope was called the McClean Telescope.


                                                        www.theramblingastronomer.co.uk


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