396 BELL SYSTEM TECHNICAL JOURNAL 



available of the propagation of waves, guided or bounded, in one, two and 

 three dimensions. It is impossible to do justice here to the richness of the 

 material, which must have cost tremendous labor and which is in great part 

 taken from the author's own publications. We find in Chapter IX, however, 

 classical problems of Fresnel optics, adroitly adapted to contemporary radio 

 needs. Chapter XI is a relatively short treatment of antenna theory, 

 principally of conical antennas, and in the last chapter we return to wave 

 guides and solve various problems involving discontinuities, even to an iris 

 or a transversal wire. This subject is still under development by the author, 

 and the readers of the Quarterly have had the benefit of one of its recent 

 extensions.^ 



The specialist in wave propagation has no need to be told of the value of 

 this book; but the reviewer would like to explain to his fellow non-specialists 

 why it is particularly important that they should not miss it. When the 

 results of much present-day research will suddenly be made available, it will 

 be a hard task to catch up, not only with the new knowledge, but still more 

 with the new modes of attack. The borderland between radio and optics 

 is one of the fields from which great things can confidently be expected. Dr. 

 Schelkunoff's book is a great opportunity for those not at present engaged in 

 research to get familiar with methods which they will want to use tomorrow. 



P. Le Corbeiller. 



