The University of Arizona
College of Optical Sciences

Collection Home > Telescopes > Pre-Achromatic > Octagonal Pre-Achromatic Telescope

 

Octagonal Pre-Achromatic Telescope

Signature Unsigned, English

Date Circa 1750
Dimensions English Metric
Main Tube Length 12.5in 318mm
Main Tube Diameter 1.3in 34mm
Total Length 22.5in 572mm
Closed Length 13.8in 349mm
Objective Clear Aperture Diameter 0.6in 14mm

Description

This telescope has an octagonal parallel mahogany barrel. The brass objective lens cell has a built-in slide cover. The objective is a single non-achromatic lens and has been replaced. It has one segmented draw, a three-lens eyepiece, and a bulbous style eyecup with a slide cover. It is not signed by the maker.

 


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