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Other Dollond Instruments


Brass Library Telescope

Signature Dollond , London

Date circa 1790
Number of Draws 1
Dimensions English Metric
Main Tube Length 43.0in 1092mm
Main Tube Diameter 2.8in 71mm
Total Length 56.3in 1430mm
Closed Length 53.5in 1359mm
Objective Clear Aperture Diameter 2.7in 68mm


This telescope has a long round parallel lacquered brass barrel. The objective lens is an achromatic doublet with a push-on cap. It has a single brass draw with rack and pinion focusing by a thumbwheel. It has several alternative eyepiece tubes that screw into the draw. 1. Terrestrial--This long tube contains four lenses, the front and rear parts fitting inside the tube at opposite ends. There is a separate pair of rear lenses, which can be exchanged to increase magnification. There are also two sun filters, of different densities, that screw onto the slightly tapered eyecup. 2. Astronomical--There are two very short two-lens eyepieces, of Huygens type. One is for higher magnification. They have slightly flared eyecups. There is a lens missing from one of the eyepieces. It is signed "Dollond * London" on the brass back plate of the barrel. The telescope mounts on a folding cabriole table top stand. It comes with a fitted mahogany case. Inside the case lid is a copper plate with this inscribed: "Alfred Lochee ESQ. M.D. With the grateful thanks of a patient and friend M.W."


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