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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


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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