CHAPTER II
HOW WORK IS DONE
Primitive man's use of the lever, p. 29—The use of the lever as conceived by Archimedes, p. 21—Wheels and pulleys, p. 32—Other means of transmitting power, p. 35—Inclined planes and derricks, p. 37—The steam-scoop, p. 38—Friction, p. 39—Available sources of energy, p. 41.
CHAPTER III
THE ANIMAL MACHINE
The oldest machine in existence, p. 43—The relation of muscle to machinery, p. 44—How muscular energy is applied, p. 44—The two types of muscles, p. 45—How the nerve-telegraph controls the muscles, p. 47—The nature of muscular action, p. 49—Applications of muscular energy, p. 52—The development of the knife and saw, p. 53—The wheel and axle, p. 55—Modified levers, p. 57—Domesticated animals, p. 59—Early application of horse-power, p. 60—The horse-power as the standard of the world's work, p. 61.
CHAPTER IV
THE WORK OF AIR AND WATER
First use of sails for propelling boats, p. 62—The fire engine of Ctesibius, p. 63—Suction and pressure as studied by the ancients, p. 64—Studies of air pressure, p. 65—The striking demonstration of Von Guericke, p. 66—The sailing chariot of Servinus, 1600 a.d., p. 68—The development of the windmill, p. 69—The development of the water-wheel, p. 70—The invention of the turbine, p. 72—Different types of turbines, p. 73—Hydraulic power and its uses, p. 74—The hydraulic elevator, p. 76—Recent water motors, p. 77.