March i8, 1892.] 



SCIENCE. 



167 



BOOK-REVIEWS. 



A. Manual of Ihe Steam-Engine. Part It: Design, Construction, 

 and Operation. By R. H. Thurston. New York, Wiley. 

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The first part of tlie " Manual of the Steam-Engine " we have 

 already noticed. Its purpose was twofold: (l)the development 

 of the mathematical theory from the simple forjii applicable to 

 the Carnot engine to a form that would assist the mechanical 

 ■engineer in following the flow of energy into the engine of practice 

 and its oonrersion into power or loss in many ways; (2) the appli- 

 cation of the principles of thermo-dynamicsand the data obtained 

 by experiment to the computation of the quantities of heal, steam, 

 ami fuel required for the production of power in a given engine, 

 and the determination of the proportions of engine and distribu- 

 tion of steam that would give tlie best result. 



But so much has been gained by experience, simply, in the de- 

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Part II. of his Man\ial to cover the more usual methods of design, 

 construction, and operation of the steim-engine. Part I. contains 

 the scholanic foundation; Part II., the practitioner's super-struc- 

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The two volumes already issued, it is proposed by the author, 

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After treating the portions of his subject which are recognized 

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 Designing for a minimum cost is a matter which every experienced 

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 sider; but scientific methods of computation of minima rarely 

 have been known or practised. 



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