The University of Arizona
College of Optical Sciences

Collection Home > Telescopes > Monocular Multiple-Draw > Ivory Opera Glass


Ivory Monocular

Signature None

Date Early 1800s
Number of Draws 2
Dimensions English Metric
Main Tube Length 2.0in 50mm
Main Tube Diameter 2.0in 50mm
Total Length 4.2in 107mm
Closed Length 2.4in 60mm
Objective Clear Aperture Diameter 1.5in 38mm


This monocular has a two piece brass barrel, the forward section having a larger diameter.  Both sections are covered with a fluted material resembling ivory.  The objective lens is an achromatic doublet.  It has two brass draws (lightly gold-plated), a single eye lens, and a flared eyecup.  It is not signed by the maker.   


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