The University of Arizona
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Binocular Opera Glass


Date Early 1800s
Dimensions English Metric
Main Tube Length 2.6in 65mm
Main Tube Diameter 2.2in 55mm
Total Length 3.7in 95mm
Closed Length 2.9in 75mm
Inter-Pupilary Distance 2.5in 64mm
Objective Clear Aperture Diameter 1.7in 44mm


This pair of binoculars has curved tapered brass barrels, covered with panels of yellow-colored mother-of-pearl.  The objective lenses are achromatic doublets, contained in brass cells.  It has brass tubes, single eyepiece lenses, and disc-shaped eyecups, made of mother-of-pearl.  The frames and all other metal parts are lightly gold-plated brass.  Focusing is done with a thumbwheel.





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