CONTENTS 



PAGE 



LECTURE I 

 OF Matter and its Properties .... .1 



LECTURE II. 

 Of Central Forces ..... 24 



LECTURE III. 

 Of the Mechanical Powers . . ... 53 



LECTURE IV. 



Of Mills, Cranes, Wheel-carriages, and the 



Engine for Driving Piles ..... 79 



LECTURE V. 



Of Hydrostatics, and Hydraulic Machines in 



general ....... ... 113 



LECTURE VI. 



Of Pneumatics . ....... 



LECTURE VH. 

 Of Optics ..... ..> 228 



