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BOOKS AND PAMPHliBTS

The Behavior of thin-wall monocoąue eyiinders under torsion&l vibration, by Robert E. Pekelsma. Washington, 1937.    9 p.

diagrs. (H.A.G.A. Technica.1 notes no.^; 607)

Charts for checking the stability of piano systems of rods, by K. Borkraann. Washington, 1937.    12 p. diagrs., tables.

(N.A.C.A. Technical memorandom^ no. 837) (Front Luftfahrt-forschung, MUnchen und Berlin, Feb. 20, 1937, v. 14, no. 2, p. 19)

Diffusion of concentrateć loi.ds into monoeoque struetures, by

II. L. Cox, II. E. Smith and C.G. Conway. London, H.M. Stat. off., 1937.    16 p. illus. (A.R.C. R. & M. no. 1780)

19 p. diagrs., illus. (A.R.C. R. & M. no. 17'-5)

The Influence of end constraint on the torsional stiffness of a rectangular section tubę, by J.C.K. Shipp. London, H. M.

Stat. off., 1937.    7 p. illus. (A.R.C.    3. k M. no. 1730)

• «

Kerbspannungslenr-e, von Ii. Neuber. Berlin,' Verlag J. Springer, 1937.    160 p. illus.

Knickung, -cippung, beulung, von Friedrich Hartmann. Leipzig;

WŁ en, Frań z; Deuticke, 1937.    201 p. illus.

Die Methode der grundkoorćinaten, von G. Kruck. Ztirieh; Leipzig, GebrUder Lehmann und co., 1937.    84 p. charts, diagrs.,

tables.    •'

Moment eąuations; a methoć of analysis for continuous beams and rigid fraraes, by Alfred Jensen. Seattle, University of Washington, 1937,    88 p. diagrs., tnbJ.es. (Engineering

experiment station bulletin no. 92) fAbstract Engineering news-reeord, New York, May 26, 1938, v. 120, no. 21, p. 753)

Neuere methoden zur statik der r&hmentrugwerke, von A. Strassner. Berlin, W. Ernst und sohn, 1937.    142 p. illus. (Ręyiew

L^f0ssature metalliąue, Bruxelles, Oet. 1937, p. 506)

Relaxatlon taetriods applied to a spar of var/ing section, deflected by transverse loading cornbined v/Ith end thrust or tension, by K.N.E. Sradfield, R.J. Atkinson and F.R.S. Southwell. London, H. M. Stat. off., 1937.    35 o. diagrs?,, illus., tables.

(A.R.C. R. & M. no. 1320)

Relaxat.ion methods applied to grid framenorks, by D.S. Christopher-son. London, II. M. Stat. off., 1937.    12 p. illus., tables.

(A.R.C. R. & M. no. 1824)    i'