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College of Optical Sciences

Collection Home > Telescopes > Monocular Multiple-Draw > Four-Draw Brass Opera Glass

 

Four-Draw Brass Monocular

Signature  

Date Early 1800s
Number of Draws 4
Dimensions English Metric
Main Tube Length 1.0in 26mm
Main Tube Diameter 1.7in 43mm
Total Length 2.8in 70mm
Closed Length 1.2in 31mm
Objective Clear Aperture Diameter 1.4in 35mm

Description

This monocular has a short round parallel barrel, covered with a textured band of gold-colored metal.  The objective is an achromatic doublet.  It has four brass draws (lightly gold-plated).  It is likely that there were originally six draws.  The single eye lens is a replacement and appears to have been mounted in the back end of the fourth draw.  The eyecup is missing.  It is not signed by the maker.

 

 


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