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English Prism Binoculars
|Interpupilary Distance (min)||2.3in||59mm|
|Interpupilary Distance (max)||2.8in||70mm|
|Objective Clear Aperture Diameter||0.6in||15mm|
These early Porro-prism binoculars have a brass housing and indicate an optical power of 4X. The binoculars show a serial number of 7476 and a patent date of 11-7-1900. The main housing is leather covered.
College of Optical Sciences
The University of Arizona, 1630 East University Boulevard, Tucson, Arizona U.S.A. 85721-0094
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