Workbook in meteorology

Likewise combinations of charts, both of the improved scales are numerous. Electrical engineering has not sliding type and the stationary type are available. heen neglected for there are many means of reducing laborious calculations. Notable among these are the charts for determining reactances and frequencies. The present book is one of charts covering alternating current calculations in series circuits, parallel circuits, series- parallel and mesh circuits, at frequencies There are 72 plates used to compute refrom I0 cycles to 1000 megacycles. or admittance. actance or impedance and another 72 plates for susceptancc These charts are arranged in groups of nine, each group having the same frequenr!, The charts are range but with ascending values of reztctance or susccptanre. printed in two colors, the frequency-resistance logarithmic coordinate system is The printing job is in green and the inductance-capacitance ay,stem in red. exceptionally well done so that the charts may be used for a maximum of accuracy.. Communication and power engineers \vill find here a tool which is a time anti labor saver. R. H. OIW~RMANN. WORKROOK IN METEOROLOGY, by Athttlstnn F. Spilhaus and James E. Miller. New York, McGraw-Hill Book 163 pages, charts and maps, 24 X 29 ems. Co., Inc., 1942. Price $2.50. This book is exactly what its title implies, a series of exercises of what is similar to a laboratory course in another field of study. The materials for working the exercises, with the exception of ordinary graph paper, are included in the book. For some exercises the requisite charts and maps are found in a pocket inside the back cover. The exercises are divided into four groups. Group 11 contains nine exercises on the mean condition of the atmosphere. To give an idea of the nature of the work covered one of these was selected at random. It was number 6 and it related to rainfall of the world. First a brief explanation is given of rainfall and the means of expressing it (isohyets). Then considerations are listed in drawing isohyets and this is followed by data and procedure in preparing a report. Other groups of exercises are on instruments and methods of observations, dynamical meteorology, and weather map and upper air analysis. ‘There are a number of useful appendixes and a subject index in the back. For anyone interested in the subject, the book offers fascinating and practical exercises. It has valuable material for a course in meteorology. li.

H. ~PI’TIR>rANS.

MAN’S PHYSICAL UNIVERSE, by Arthur Talbot Bawden. Revised edition, 832 pages, illustrations and diagrams, 16 X 24 ems. New York, The Macmillan Co., 1943. Price $4.00. It is being said more frequently today that the future of the world should be based on the scientific attitude and its problems should be solved by means of the scientific method. Certainly it is plain that as society is now organized no one can live by and for himself alone, berauqe his own welfare is bound up with that of the community in which he lives. But life has become more complicated with the rise of industrialism, the old communities are hardly recognizable, and the