Collimator telescope, 1 1/2-inch aperture and 10-inch focal length, and mahogany case, by Troughton & Simms, London. Used for levelling and adjustment of a transit instrument. Collimator telescope 1860-1880
Collimator telescope, 2-inch aperture and 17-inch focal length, with metal stand and mahogany case, by Cooke & Sons, London & York. Used for levelling and adjustment of a transit instrument. Collimator telescope 1922-1930