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Title: Glass triangular prism, from artillery dial gun sight [Go to resource]
Description: Triangular glass erecting prism (refracting angle 90�), from British No.7 artillery dial gun sight, unsigned, 1930-1930. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: erecting prism
component - objectTemporal: 1930-1950 Source: Science Museum Creator: Unknown maker Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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