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.

College of Optical Sciences
The University of Arizona, 1630 East University Boulevard, Tucson, Arizona U.S.A. 85721-0094