By Prof. J. P. Den Hartog. Fourth edition. Pp. xii + 436. (London: McGraw-Hill Publishing Company, Ltd., 1956.) 67s. 6d.
Practical Solution of Torsional Vibration Problems
With Examples from Marine, Electrical, Aeronautical, and Automobile Engineering Practice. By Dr. W. Ker Wilson. Vol. 1: Frequency Calculations. Third edition, revised. Pp. xxxii + 704. (London: Chapman and Hall, Ltd., 1956.) 105s. net.
Rayleigh's Principle and Its Applications to Engineering
The Theory and Practice of the Energy Method for the Approximate Determination of Critical Loads and Speeds. By Dr. G. Temple and Dr. W. G. Bickley. Pp. vi + 154. (New York: Dover Publications, Inc., 1956.) 1.50 dollars.