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Glass triangular prism, from artillery dial gun sight

1930-1950

Triangular prism assembly

1910-1950

Prism of crown glass angle 90 degrees

Rangefinder eyepiece prism (see note).

Prism part of turret type tent camera obscura

1840-1860
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
Optical parts of Lassell's telescope:- prism for 9-in reflector in green cardboard box; 3 multiple eyepieces; 5 small eyepieces; plane speculum on arm for 9-in; speculum for Newtonian finder in tin case 4 eyepices; 4 diaphragms (3 in two tin cases and one in wood case with metal lid)

Optical parts of Lassell's telescope:- prism for 9-in reflector in green cardboard box

1840-1850
Optical parts of Lassell's telescope:- prism for 9-in reflector in green cardboard box; 3 multiple eyepieces; 5 small eyepieces; speculum for Newtonian finder in tin case 4 eyepices; 4 diaphragms (3 in two tin cases and one in wood case with metal lid)

Optical parts of Lassell's telescope

1840-1850