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Other Gilbert Telescopes

 

Single-Draw Pocket Telescope

Signature J. Gilbert, Tower Hill, London

Date Late 1700s
Number of Draws 1
Dimensions English Metric
Main Tube Length 3.3in 84mm
Main Tube Diameter 1.4in 35mm
Total Length 5.7in 145mm
Closed Length 3.9in 100mm
Objective Clear Aperture Diameter 1.2in 30mm

Description

This monocular has a round parallel mahogany barrel, with a push-on objective lens cap.  The original objective may have been an achromatic doublet, but it has been replaced with a pair or lenses that are not achromatic.  It has one brass draw (with no retention), an eye lens, and a tapered eyecup with a sliding cover.  It is signed "J*GILBERT   Tower Hill   LONDON" on the draw, with the eyecup to the left.

 

 


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