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Optical glass prism assembly from artillery range-finder

1900-1926

Beam-splitter glass prisms from artillery range-finder

1912-1950

'Porro' type optical system taken from field glass binoculars

1930-1950

'Porro' optical system, from a trench periscope

1910-1920
Nine prisms in wooden box, including a composite one made out of six different glasses, 5 by Chance of Birmingham, with MS list of the glasses, late 19th century (Wellcome B885)

Nine prisms in wooden box

1880-1900