Bishop Harman's diaphragm test, c 1908-1930.
2 9 c m
40cm
actual image size: 32cm x 21cm

Bishop Harman's diaphragm test, c 1908-1930.

© Science Museum / Science & Society Picture Library

Description

Eye test, invented by Bishop Harman and made by George Culyer Ltd.
 

Image Ref.

10287572
 

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