REVIEWS 145 



Higher Mechanics. By Horace Lamb, Sc.D., LL.D,, F.R.S., Honorary- 

 Fellow of Trinity College, Cambridge ; lately Professor of Mathematics 

 in the Victoria University of Manchester. [Pp. x + 272.] (Cambridge : 

 at the University Press. Price 25s. net.) 

 Prof. Lamb's book, which treats of three-dimensional Kinematics, Statics, 

 and Dynamics, is very welcome. It is to some extent a sequel to Statics (Cam- 

 bridge, 1912) and Dynamics (Cambridge, 1914), but it is not dependent on 

 these. Prof. Lamb has adopted, as his principle of selection in this book, that 

 matters of genuine or dynamical importance be included, and developments 

 whose interest is purely mathematical or mainly historical be omitted. Thus 

 he treats the Theory of Screws, of Null Systems, and of Least Action, and 

 omits brachistochrone problems, and the general theory of the Differential 

 Equations of Dynamics. 



Statique Dynamique. By M. Stuyvaert. [Pp. 205.] (Ghent : Van 



Rysselberghe & Rombaut, 1920. Price 2ofcs.) 

 In this comparatively small volume the author has succeeded in giving a 

 very clear account of the fundamental principles of mechanics. Statics 

 finds its basis in Newton's laws of motion, and from this point of view the 

 discussion of the equilibrium of a particle and of extended bodies follow in 

 a natural sequence. There is a brief treatment of graphical statics and the 

 attraction of spheres, and the volume concludes with chapters devoted to 

 the fundamental principles of particle and rigid dynamics. Without entering 

 into practical details the experimental basis of the science is well brought out. 

 To attempt to cover so wide a field in one small book naturally leads to 

 considerable compression, yet the excellent arrangement and printing makes 

 it easy to trace the development of the subject, and it should prove a valuable 

 introduction to mechanics for those who come to it for the first time with 

 some knowledge of the calculus. G. B. J. 



The Scientific Papers of Bertram Hopkinson, C.M.G., M.A., F.R.S., Fellow 

 of King's College, and Professor of Mechanism and Applied Mechanics 

 in the University of Cambridge. Collected and arranged by Sir J. 

 Alfred Ewing, K.C.B., F.A.S., and Sir Joseph Larmor, F.R.S. 

 [Pp. xxvii + 479.] (Cambridge : at the University Press, 1921. 

 Price 63s. net.) 



This book contains all the more important papers of Professor Hopldnson, 

 with the exception of his memoir on the Theory 0} Vibrations of Systems 

 having One Degree of Freedom, which forms the introductory volume of the 

 series of Cambridge Tracts in Engineering. The collection and arrangement 

 of the papers on mathematical and engineering science, published in various 

 journals from 1898-1914, has been in the hands of Sir J. Alfred Ewing and 

 Sir Joseph Larmor. The value of the book is very great ; and it is of real 

 interest to have on record in the obituary notices of Sir Alfred Ewing and 

 Mr. A. V. Hill (reprinted from the Proceedings of the Royal Society and the 

 Alpine Journal respectively), many details of the life and career of so brilliant 

 a scientist. Apart even from the scientific value of the book, we are glad 

 to welcome it as a memorial to a man in whom the passion for research was 

 strong. 



PHYSICS 



The World of Sound. By Sir William Bragg, K.B.E., D.Sc, F.R.S., Quain 



Professor of Physics in the University of London. [Pp. viii -|- 196, 



with 93 figures.] (London : G. Bell & Sons, 1920. Price 6s. net.) 



Sir William Bragg has used the material of his Royal Institution lectures 



on Sound to make one of the most delightful nature books we have ever 



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