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National advisory committee for aeronautics: Report No. 559, The forces and moments acting on parts of the XN2Y-1 airplane during spins, by N. F. Scudder, 8 pages, tables, 23 × 29 cms. Washington, Superintendent of Documents, 1936.Price five cents

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

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✦ Synopsis

BOOK REVIEWS. 639 drag and the other measurements of the pressure difference between the front stagnation point and the rear portion of the sphere. Satisfactory correlation between the two methods was obtained experimentally, as set forth in an appendix to the report.

The following table indicates the relative status of the wind tunnels tested as regards the amount of turbulence normally encountered in their air streams, the least turbulent being listed first: Full-scale tunnel. 24-inch high-speed tunnel. 2o-foot tunnel. Model of the full-scale tunnel. 7-by Io-foot tunnel. 5-foot vertical tunnel. Free-spinning tunnel. Variable-density tunnel.

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National advisory committee for aeronautics: Report No. 416, The N. A. C. A. variable-density wind tunnel: by Eastman N. Jacobs and Ira H. Abbott, 12 pages, illustrations, 23 × 29 cms. Washington, Superintendent of Documents, 1932. Price five cents
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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