The University of Arizona
College of Optical Sciences

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Pre-Achromatic Telescope

Signature Unsigned

Date circa 1750
Dimensions English Metric
Main Tube Length 17.5in 645mm
Main Tube Diameter (objective end) 1.5in 39mm
Main Tube Diameter (eyepiece end) 1.3in 33mm
Total Length 27.5in 700mm
Objective Diameter .7in 18mm


This telescope has a round tapered wood barrel.  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 flared eyecup with a swivel cover.  It is not signed by the maker.




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