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Three prism objects in brass mounts

1850-1924
Pair of 'Porro' type erecting glass prisms (90º of reflection), unsigned, European, 1920-1950.

Pair of glass 'Porro' type erecting prisms

1920-1950
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
Two pressed prisms in white ophthalmic crown glass, by Chance-Pilkington, St. Asaph,Clwyd, Wales, 1980. To be optically worked for use in binoculars

Two pressed prisms in white ophthalmic crown glass

1980
Three prism objects in brass mounts: set of Porro twin prisms in brass demonstration mount; camera lucida attachment for use with microscope; six planer glass round pieces in brass mounts, unsigned, United Kingdom, 1850-1924 (Wellcome No. B1062)

Three prism objects in brass mounts

1850-1924