The University of Arizona
College of Optical Sciences

Collection Home > Telescopes > Prism Binoculars > English Prism Binoculars

Other Instruments by Ross


English Prism Binoculars

Signature Ross, London

Date Early 1900s
Dimensions English Metric
Height 2.0in 51mm
Extended Length 3.9in 98mm
Closed Length 3.5in 90mm
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

All contents copyright 2008  Arizona Board of Regents.