Vi CONTENTS. 



CHAPTER VI. 



PAGB 



Application of Force 87 



Section I. — The Elemexts of MAcui>fERY 93 



" II.— Friction 112 



CHAPTER YII. 



On the Strength of Materials used in the Arts, and their Appli- 

 cation TO Architectural Purposes 116 



Section I. — On the Strength of Materials 115 



" IL — ^Application of Materials to Structural Pur- 

 poses .' 119 



CHAPTER VIII. 



Hydrostatics 123 



Section I. — Capillart Attraction 142 



CHAPTER IX. 

 Htdbauucs 148 



CHAPTER X. 

 Pneumatics 163 



CHAPTER XI. 



Acoustics 183 



Section I. — Musical Sounds 194 



" IL — Reflection of Sound 197 



« III. — Organs of Hearing, and the Voice 201 



CHAPTER XII. 



Heat •_ 205 



Section I. — Sources of Heat 208 



" II. — Communication of Heat 216 



•' III. — Effects of Heat 227 



«< IV.— The Steam-Engine 251 



« Y. — Warming and Ventilation 260 



