Radcliffe twin refactor telescope was built in 1901 by Grubb of Dublin. Originally for the Radcliffe observatory in Oxford where it was used primarily for parallax work. It was moved to Mill Hill in 1938. This is the largest telescope on the site with a massive dome, It has one 24" refractor and one 18" refractor piggy backed on a German Equatorial Mount. A computer controlled guidance system was built for it in the early 90s.