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Collection Home > Telescopes > Prism Binoculars > English Prism Binoculars
English Prism Binoculars
| Signature | Ross, London |
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| 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 | |||
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Description |
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. |
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