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### Contents

 SYNOPSIS OF CHAPTERS 5 CHAPTER II 54 CHAPTER III 91
 and Division of the Subject 1 Pressure 129 CHAPTER V 179 CHAPTER VI 215

### Popular passages

Page 132 - ... is the depth of its centre of gravity below the surface of the liquid.
Page 274 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Page 54 - Buchanan that the same quantity of human labour employed in working a pump, turning a winch, ringing a bell, and rowing a boat, are as the numbers 100, 167, 227, and 248. The most advantageous manner of applying human strength is in the act of rowing.
Page 224 - ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes.
Page 70 - In the wheel and axle, an equilibrium takes pl.ice when the power multiplied by the radius of the wheel, is equal to the weight multiplied by the radius of the axle ; or P : W : : CA : CB.
Page 167 - ... volume of water required to pass a boat up or down is termed the prism of lift. The calculation, therefore, for the quantity of water requisite for the service of the navigation, will be simply that of the number of prisms of lift...
Page 168 - Rule. — Measure the depth from the surface of the water to the centre of the orifice of discharge, in feet, and extract the square root of that depth ; multiply it by...
Page 247 - ... from, the eye, till they seem exactly to cover the small circle viewed through the telescope. The quotient obtained by dividing the distance of the paper circle by the distance of the parallel lines from the eye, will be the magnifying power of the telescope.