CONTENTS. xi 



SECT. 5. Hydraulic Engines. 



Engines moved by the impulse of 



Water, - Page 2H 



Machines moved by the weight of 



Water, - 217 



Machines moved by the re-action of 



Water, 219 



AEROSTATICS. 



SECT. 1. Heat, - - 223 

 2. Equilibrium of Elastic Fluids, 



PNEUMATICS. 



SECT. 1. Air as accelerating or retarding Mo- 

 tion. 



Machines for raising Water, 256 



Steam-engine, 262 



Motion produced by Gun-powder, 267 

 Bodies impelled by Currents in the 



Atmosphere, or by the Winds, 273 

 Resistance of the Air to Projectiles, 276 



2. Air, as the vehicle of Sound. 



Vibration of Sonorous Bodies, 281 



Propagation of Vibrations through 



the Air, - 287 



" 3. Air as the vehicle of Heat and Moi- 

 sture, 291 

 Wind, - - 305 

 Rain, - - 



OUTLINES 



