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

Description

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.

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