Glass triangular prism, from artillery dial gun sight

Made:
1930-1950 in United Kingdom
Triangular glass erecting prism (refracting angle 90?)

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Triangular glass erecting prism (refracting angle 90?)
Science Museum Group
© The Board of Trustees of the Science Museum

Triangular glass erecting prism (refracting angle 90º), from British No.7 artillery dial gun sight, unsigned, 1930-1930.

Details

Category:
Optics
Object Number:
1955-317
Materials:
glass
Measurements:
overall: 23 mm x 25 mm x 23 mm, Wt. 0.018kg
type:
erecting prism and component - object
credit:
Banfield, Arthur Clive