Some Books Recently Received: The Theory of Aerodynamics—A Revised Handbook‐Metal Aeroplanes—Structural Practice Available to Purchase

IT is perhaps not surprising, in view of the remarkable advancements which have been made in Aerodynamic Theory during the last two decades, that the literature on this subject is now very extensive. In early days, Lamb's mathematical treatise, Hydro‐dynamics, and Lanchester's classical works, Aerodyvamics and Aerodonetics, were in existence, but other information had to be gathered from scattered sources. Nowadays, many books dealing exclusively with aerodynamics are available, and guidance can profitably be sought before a course of reading is planned.