XIV CONTENTS. 



CHAPTER XIII. 



ARTS. ^ PAGES 



275 284. Kotation of the Earth, Weight, Acceleration due to Gravity, 



Pendulum 351360 



285289. Eelativity of Force. Universal Gravitation . . . 360366 

 290, 291. Measurement of time. Effect of change of time-measuring 



process 366 370 



APPENDIX. 



292 299. Measurement, Units, and Dimensions .... 371375 



INDEX . 377379 



