## 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
β¦ LIBER β¦
A new pyrophoric cerium and magnesium alloy
- Publisher
- Elsevier Science
- Year
- 1911
- Tongue
- English
- Weight
- 89 KB
- Volume
- 171
- Category
- Article
- ISSN
- 0016-0032
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