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National advisory committee for aeronautics: Report No. 557, Preliminary Tests in the N. A. C. A. Free-Spinning Wind Tunnel, by C. H. Zimmerman. IS pages, tables, illustrations, 23 × 29 cms. Washington, Superintendent of Documents, 1936. Price ten cents.

✍ Scribed by J.F.I


Publisher
Elsevier Science
Year
1936
Tongue
English
Weight
165 KB
Volume
222
Category
Article
ISSN
0016-0032

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## BOOK REVIEWS. 495 This latter process has supplanted all the others in respect to its industrial importance. Following a brief chapter on the history of nitrogen fixation processes which, in addition to the two just mentioned, includes the cyanamide and alkali cyanide methods as well, further