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College of Optical Sciences

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Pre-Achromatic Telescope

Signature Unsigned, English

Date circa 1750
Dimensions English Metric
Main Tube Length 9.0in 228mm
Main Tube Diameter (objective end) 1.3in 32mm
Main Tube Diameter (eyepiece end) 1.1in 29mm
Total Length 15.7in 400mm
Objective Diameter .7in 19mm

Description

This telescope has a round tapered wood barrel, with an unusual striped pattern.  The brass objective lens cell has a built-in slide cover.  The single objective lens is non-achromatic.  It has one segmented brass draw, a three lens eyepiece, and a bulbous style eyecup with a slide cover.  The eyepiece lens nearest the objective is a replacement.  It is not signed.

 


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