'Porro' type optical system with modified cemented 'Porro' glass prisms and cemented magnifying eye-piece field-lens, taken from (7 x 50) field glass binoculars by Barr and Stroud Limited, Glasgow, Scotland, 1930-1950.
- Object Number:
- component - object
- furnishing and equipment
- tools & equipment
- optical instrument
- optical instrument component
- prism - optical
- erecting prism
- roof prism
- Banfield, Arthur Clive
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