PREFACE. 



present work on Hydromechanics is designed as a 

 text-book for Scientific Schools and Colleges, and is 

 prepared on the same general plan as the authors Analytic 

 Mechanics, which it is intended to follow. Like the Ana- 

 lytic Mechanics, it involves the use of Analytic Geometry 

 and the Calculus, though a geometric proof has been intro- 

 duced wherever it seemed preferable. 



The book is divided into two parts, namely, Hydrostatics 

 and Hydrokinetics. The former is subdivided into three, 

 and the latter into four chapters ; and at the ends of the 

 chapters a large number of examples is given, with a view 

 to illustrate every part of the subject. Many of these ex- 

 amples were prepared specially for this work, and are prac- 

 tical questions in hydraulics, etc., taken from every-day life. 



In writing this treatise, the aim has been to enunciate 

 clearly the fundamental principles of the theory of Hydro- 

 mechanics, to explain some of the most important applica- 

 tions of these principles, and to render more general the 

 study of this interesting science, by presenting as simple a 

 view of its principles as is consistent with scientific accu- 

 racy. Throughout the work a careful distinction has been 

 made between those propositions which are necessarily true, 

 being deduced from the definitions and axioms of the sub- 

 ject, and those results which are empirical, 



