๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Precision camera for testing lenses


Publisher
Elsevier Science
Year
1937
Tongue
English
Weight
110 KB
Volume
223
Category
Article
ISSN
0016-0032

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๐Ÿ“œ SIMILAR VOLUMES


Specifications for a precision mapping c
๐Ÿ“‚ Article ๐Ÿ“… 1938 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 56 KB

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Tests of lenses for foundry goggles
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CURRENT TOPICS. 637 ipated for them in the building of safes. Not only are the plates so extremely hard that they cannot be drilled, but they have a remarkable resistance to the flame of an oxyacetylene lamp. It is estimated that to burn a hole three inches in diameter and 3~ inch thick would requir