The University of Arizona
College of Optical Sciences

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Aluminum Field Glass Binoculars


Date Late 1800s
Dimensions English Metric
Tube Diameter 2.5in 65mm
Total Length 5.4in 136mm
Closed Length 4.1in 105mm
Inter-Pupilary Distance 2.6in 65mm
Objective Clear Aperture Diameter 1.9in 49mm


This pair of Galilean binoculars has aluminum bell-shaped barrels, covered in leather. The large objective lenses are achromatic doublets and have short, extendable sunshades. The central thumbwheel is used for focusing. The barrel spacing is fixed and cannot be adjusted for eye separation. It comes with a fitted leather case marked "W G W".




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