(1)Hydro- und Aeromechanik nach vorlesungen von L Prandtl (2) Handbuch der xperimenlalphysik

Abstract

(1)DR. TIETJENS has performed a very valuable service in writing his two books, based on the lectures of Prof. Prandtl at Göttingen. This second volume deals mainly with the motion of viscous fluids, and the treatment of the subject follows the lines of Prandtl's lectures, but Dr. Tietjens has amplified certain sections, particularly those dealing with the flow in pipes and with the drag of symmetrical bodies, and has added a final chapter describing experimental apparatus and technique. The book contains perhaps little that is new to the student of the subject, and for the greater part it gives a critical descriptive account of the observed phenomena and the corresponding theory rather than the details of the theoretical analysis. The great merit of the book, however, is the excellent account of the physical basis of the boundary layer theory, of the significance of evanescent viscosity in determining the nature of the flow even when the surface friction itself is negligible, and of the fundamental principles underlying the theory of the lift of an aerofoil.

(1) Hydro- und Aeromechanik nach vorlesungen von L. Prandtl.

Von Dr. O. Tietjens. Band 2: Bewegung reibender Flüssigkeiten und technisehe Anwendungen. Pp. viii + 299 + 28 Tafeln. (Berlin: Julius Springer, 1931.) 23 gold marks.

(2) Handbuch der Mxperimenlalphysik.

Haraus-gegeben von W. Wien und F. Harms. Unter Mitarbeit von H. Lenz. Band 4: Hydro- und Aerodynamik. Teil 2: Widerstand und Auftrieb. Herausgegeben von Ludwig Schiller. Pp, viii + 443. (Leipzig: Akademische Verlagsgesell-schaft m.b.H., 1932.) 41 gold marks.