The University of Arizona
College of Optical Sciences

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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 28.3in 719mm
Main Tube Diameter 2.4in 60mm
Total Length 40.5in 1029mm
Closed Length 38.0in 965mm
Objective Clear Aperture Diameter 2.0in 52mm

Description

This telescope has a 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. There is a separate terrestrial eyepiece tube, that screws into the end of the draw tube. It has four lenses and a slightly flared eyecup. There is also a sun filter that can be screwed onto the eyecup. The astronomical eyepiece tube is missing. It is signed "Dollond * London" on the brass back plate of the barrel. The telescope is mounted on a folding brass cabriole tabletop stand. It has a fitted mahogany case.

 

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