The University of Arizona
College of Optical Sciences

OSC Gallery > Telescopes > Single-Draw > Dollond Single-Draw

Other Dollond Instruments

 

Dollond Achromatic Night Telescope Draw

Signature Dollond, London/ Achromatic Night

Date Circa 1800
Dimensions English Metric
Main Tube Length 24.2in 615mm
Main Tube Diameter 2.6in 67mm
Total Length 39.0in 990mm
Closed Length 26.2in 665mm
Objective Clear Aperture Diameter 1.6in 41mm

Description

This telescope has a parallel brass barrel, covered in brown leather. The objective lens is an achromatic doublet, contained in a nickeled silver cell. The objective has an extendable sunshade. All metal parts are nickeled silver. It has a single draw, a four-lens eyepiece, and a bulbous eyecup. It is signed "Dollond London Achromatic Night" on the eye tube draw, with the eyecup to the right. There is a long-necked bird design below the signature. The creature is resting on a crown.  This designation as a "night" telescope is quite rare; the eye tube is oversized allowing larger diameter optics to be used for better night vision.

View of aperture from inversion tube.

See the red Achromatic Night

 

Inversion tube with and without lenses.

 


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

All contents copyright 2008  Arizona Board of Regents.