CONTENTS. 



RAGE 



INTRODUCTION 1 



BOOK I. 



APPLICATIONS OF THE PHENOMENA AND LAWS OF 



WEIGHT. 



CHAPTER I. 



DIRECTION OF GRAVITY' FALL OF BODIES OSCILLATIONS OF THE PENDULUM. 



I. Plumb-line and Levels 17 



II. Pile-drivers 19 



III. Clock Pendulums 23 



IV. The Movement of Rotation of the Earth and Apparent Deviation 



of the Pendulum 26 



V. Balances used in Commerce or in the Arts 28 



CHAPTER II. 



THE HYDRAULIC OR BRAMAfl's PRESS. AREOMETERS OR HYDROMETERS. ARTESIAN 



WELLS. 



I. The Hydraulic Press 33 



II. Areometers or Hydrometers 37 



III. Water-levels. Spirit-levels 41 



IV. Artesian Wells. Fountains . 44 



V. The Pipette. The Magic Funnel and Inexhaustible Bottle .... 47 



