Twin reflecting and refracting telescopes on observatory mounting, 1885
"Twin Equatorial" Telescope, 1885. Made by Sir Howard Grubb for Dr. Isaac Roberts, F.R.S., consisting of a 20in. Reflecting Telescope and a 7in. Refracting Telescope (by Cooke) mounted together on one equatorial stand. With Grubb electric control gear, spectroscope, additional 20in. mirror and other accessory pieces (one 20-inch disc slightly chipped at outside edge (Note: mounting cradle purchased from M.A.S.S. Tools Ltd 17/1/62 (#58) ScM 4429/3/4