854 



POPULAR SCIENCE MOM ELY. 



point of view, of the more important de- 

 velopments in its field. Electro technology, 

 which in the last decade has exerted an im- 

 portant action on tho.se branches of physics 

 which form its base, " seems at present," 

 says the author, " to have entered on a 

 phase of quieter development; and from the 

 scientific point of view the time appears 

 suitable to survey the position, critically to 

 investigate results of very unequal value, 

 often hastily brought to light amid the 

 bustle of practical work, and to blend the 

 older as well as the more recent results into 

 one consistent exposition." He has not in- 

 cluded much historical matter except in the 

 seventh chapter, where he gives the history 

 of the analogy between the magnetic circuit 

 and various other kinds of circuits. The 

 first five chapters of the work are devoted to 

 Theory, and the last six to Applications. In 

 stating the theory of the magnetic circuit, a 



knowledge of the results of inve?tigation3 

 into ferro-magnetic induction is assumed. In 

 Chapters III and IV the outlines of the the- 

 ory of "rigid " magnets on the one hand and 

 of absolutely " soft " cores on the other are 

 summarized, the mode of treatment being 

 similar to that of Maxwell. The topics fall- 

 ing within the second part of the book 

 magnetic circuits of dynamos or electro- 

 motors and of various kinds of electro- 

 magnets and transformers, the experimental 

 determination of field intensity, magnetiza- 

 tion, induction, etc. are treated more from 

 the point of view of applied physics. Wher- 

 ever the more important results of allied 

 branches of mathematical or experimental 

 physics are assumed to be known, the author 

 has referred lo the original passages in ac- 

 cessible text-books. There are also many 

 references to original papers in which details 

 may be further studied. 



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