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STRESS AKAŁYSIS

Design of trussed metal spars for single bay airplanes, by E. C. Friel. Washington, U.S. Govt. print. off., 1928.    40 p.

diagrs., illus., tables. (Air corps information circular no. 621)

The Influence of the ribs on the strength of the main piane spars, by C. B. Biezeno, J- J. Koch and C. Koning. Verslagen en verhandelingen von den rijks-stuaiedienst voor de iuchtvaart, rapport, Amsterdam, Dec. 4, 1927. v. 175, p. 99-137. diagrs., illus.

Calcul d^?un longeron d^faile, par F. Orain. L^rAeronautiąue, Paris, July 1927, no. 98, p. 223-25. diagrs.

Die Ermitt.lung des gUnstigsten ąuerschnitts eines auf biegung beanspruchten kastenholms, von A. von Baranoff. Z.F.M., MUnchen, Feb. 28, 1927, v. 18, no. 4, p. 80-83. diagrs., illus.

Approxiniations for column effect in a lr piane wing spars, by Edward p. Warner and Mac Short. Washington, U.S. Govt. print. off., 1927.    20 p. diagrs. (N.A.C.A. Report no. 251)

Some problems in aeroplane structural design, by H. B. Howard. Journal of the R.A.Ś., London, Apr. 1926, v. 30, no. 184, p. 238-66. illus.

Calculations of wing spars of variable cross-secticn and linear load, by Leon Kirste. Washington, 1925.    5 p. illus.

(N.A.C.A. Technical memorandums no. 305) (Frora L¹Aeronautiąue Paris, Jan. 1925, v. 7, no. 68, p. 25-26)

Wing-spar stress ch&rts and wing-truss proportions, by Edward P. Werner. Washington, U.S. Govt. print. cff., 1925.    18 p.

diagrs. (N.A.C.A. Report no. 214)

The Design of wing spar sections, (combined bending and coinpres-sion), by Edward P. Warner. Aviation, New York, May 29,

1922, Apr. 7, 1924, v. 12, 16, no. 22; 14, p. 626-27; 358-60. diagrs.

The Distribution of load araong the spars in multi-spar construc-tion of airplane wings, by J.S. Newell. Washington, U.S.

Govt. print. off., 1923.    10 p. illus. (Air service in

formation circular no. 394)

The Effect of eccentrioities on stresses in airplane spars, by A.S. Niles and R.A. Miller. Washington, U.S. Govt. print. off., 1923.    10 p. diagrs. (Air service information cir

cular no. 438)

Calculation of wing spars, by Julius Ratzersdorfer. Washington,

1921. diagrs. (N.A.C.A. Technical memorandums no. 34) (Erom Z.F.M., MUnchen und Berlin, Apr. 30, 1920, v. 11, no. 7-8)