Pair of proof plates (one item, showing interference colours), used for testing curvature in the manufacture of high class lenses by J.H. Dallmayer Ltd., London, England, 1909.
- Object Number:
lens: 15 mm x x , 47 mm, .045kg
test base: 21 mm x x , 55 mm, .105kg
- J H Dallmeyer Ltd
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