Mathematical and Physical Sciences

Abstract

Two years have elapsed since the English edition of Prof. Pohl's “Physical Principles of Electricity and Magnetism” was published, and many teachers of physics who were charmed with the novelty of his treatment and the ingenuity of his experiments will welcome this new volume on mechanics and acoustics. The numerous diagrams and illustrations at once attract attention. Most of the figures are based on photographs, and several have been made into silhouettes. It is claimed that this simple method of reproduction indicates whether an experiment is suited to a large lecture-room, as it is then important that the outlines should be clear and uninterrupted. Prof. Pohl tells us that in the Göttingen lecture-room that “troublesome obstacle, the large fixed lecture-table, was got rid of years ago”. Small handy tables are set up as required. “The apparatus in actual use at any moment can be made to stand out so that it is easily seen by each member of the audience.” Special mention ought to be made of the plates illustrating streamline flow in liquids and gases, and of the exceptionally clear photographs of waves on the surface of a liquid and of sound waves in air by the schlieren method.

Physical Principles of Mechanics and Acoustics.

By Prof. R. W. Pohl. Authorized translation by Winifred M. Deans. Pp. xii + 338. (London, Glasgow and Bombay: Blackie and Son, Ltd., 1932.) 17s. 6d. net.