TABLE OF CONTENTS. 



Xlll 



Dr. Hutton's theory . . page 74 



Evaporation 75 



Rainbows 75 



Effect of mountains on the 

 atmosphere 75 



Garnerin's balloon ...page 76 



Coal gas balloons 76 



Greatest elevation attained 76 



Colour of the sky 76 



Another explanation 77 



MECHANICS. 



Subd ivisions of mechanics. . 78 



Quantities 78 



Statics 79 



The vis inertise of nature . . 79 



The lever 79 



The wheel and axle 80 



Percussion on one point ... 80 

 The Rota Aristotelica, or 



Aristotle's wheel 81 



The descent of bodies 81 



Force 82 



Velocity 82 



The solid of least resistance 82 



Light and sound 83 



From pole to pole 83 



Gunpowder 83 



Range of shot, rockets, and 



bombs 84 



Horse power 84 



Man power 85 



Dog power 85 



Draught 85 



Carriage springs 86 



Steam-engines 86 



Wolfe's steam-engines 87 



Perkins's steam-engine .... 87 



Explosive engine 88 



Brown's pneumatic engine . 88 

 Bulk and elastic force of 



steam 88 



Power and velocity of steam- 

 boats 89 



High pressure 90 



Rarefaction 90 



A vacuum 91 



Bramah's locks 91 



Solid figures 91 



Touch 91 



Elastic bodies 9i 



La Place's theory of elastic 



fluids 92 



HYDROSTATICS. 



Hydraulics 93 



Pressure of fluids 93 



Pressure of fresh water. ... 93 



The hydraulic press 94 



Lateral pressure 94 



Power of water 95 



Balance in hydrostics 95 



Weight of water 95 



Capillary attraction 95 



Sea water 



Salt water ice 96 



Expansion of spirits 96 



Pressure of water by height 96 



