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Cerium tin alloys

Publisher
Elsevier Science
Year
1912
Tongue
English
Weight
64 KB
Volume
173
Category
Article
ISSN
0016-0032

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## March, I917.] CURRENT TOPICS. 369 hole about a quarter of an inch in diameter, we can see the subject through it from any part of the plate area. In this way we practically turn the camera into a finder of the frame type, and this is all tl~at is necessary, actual focussing being neither requir