2C6 Notices respecting New Books. 



The second book relates to dynamics. It comprehcrtds 

 fix chapters; treating of motion, uniform and variable; the 

 descent and ascent of heavy bodies in vertical lines ; the. 

 motion of projectiles, with observations on ricochet-firing ; 

 descents along inclined planes and curves ; the vibrations of 

 pendulums, and the curve of swiftest descent ; central forces; 

 the rotation of bodies about fixed axes, and in free space, 

 with theorems relative to the centres of oscillation, gyration, 

 percussion, spontaneous rotation, &c.; the physico-mathe- 

 niatical theory of percussion, nearly as first delivered in Don 

 Georg-c Juan's Examcn Maritimo ; and the motion of ma- 

 chines, and their maximum effects; closing with some re- 

 marks showing in what points of view machines ought to 

 be considered by those who would labour beneficially for 

 their improvement. 



Book III. is devoted to the subject of hydrostatics. It is 

 divided into four chapters, — on the pressure of non-elastic 

 fluids; the determination of the specific gravities of solid 

 and fluid bodies ; the construction of hydrometers or areo- 

 meters; the equilibrium, stabilitv, and oscillations of float- 

 ing bodies, with a particular reference to ships and canal 

 boats ; and on the phsenomcna of attraction in capillary 

 tubes. This book contains an extensive and correct table 

 of specific gravities. 



In the fourth book are given some of the most useful propo- 

 sitions and theorems relative to hydrodynamics. It comprises 

 four chapters. 1. On the discharge of fluids through aper- 

 tures in the bottom and sides of vessels, and on spouting 

 fluids : 2. An account of experiments made l)y difl"erent phi- 

 losophers (as Bossut, Venturi, Eytelwein, Young, Vince, 

 Sec.) on the discharge of water through apertures and tubes; 

 and the practical deductions from those experiments : 3. On 

 the effect of water upon the motion of water-wheels : 4. An 

 account of Mr. Smeaton's experiments on water-wheels. 



The fifth book, which terminates the first volume, is on 

 pneumatics, and contains six chapters. The subjects staled 

 and discussed in this book are, the equilibrium of elastic 

 tluids ; the measurement of allitudcs with the baronieter and 

 thermometer J the motion of air when the equilibrium of 



pressure 



