When were carts first used? p. 152--The development of the bicycle, p. 154--The pneumatic tire introduced, p. 155--The coming of the automobile, p. 156--The gas engine of Dr. Otto, p. 157--Cugnot's automobile, p. 158--The automobile of William Murdoch, 1785, p. 158--Opposition in England to the introduction of automobiles, p. 159--An extraordinary piece of legislation, p. 161--Scientific aspects of automobile racing, p. 164--Some records made at Ormonde, p. 165--Records made by Oldfield in 1910, p. 166--Comparative speeds of various vehicles and animals, p. 167--Speed of birds in flight, p. 168--A miraculous transformation of energy, p. 170--Electrical timing device for measuring automobile speeds, p. 171. CHAPTER VI THE DEVELOPMENT OF ELECTRIC RAILWAYS New York the first city to have a street railway, p. 175--Cable systems, p. 177--Early self-sustained systems, p. 178--The electro-magnetic locomotive of Moses G. Farmer, p. 179--The efforts of Professor Page to produce a storage battery car, p. 180--The experiments of Siemens and Halske with electric motors, p. 181--The Edison electric locomotive, p. 182--Third rails and trolleys, p. 184--The inventions of Daft and Van Depoele, p. 185--The work of Frank J. Sprague in developing electric railways, p. 186--How the word "trolley" was coined, p. 187--Storage battery systems, p. 188--The Edison storage battery car of 1910, p. 189--Monorail systems, p. 191--Electric aerial monorail systems, p. 193. CHAPTER VII THE GYROCAR Mr. Louis Brennan's car exhibited before the Royal Society in London, p. 195--How the gyroscope is installed on this car, p. 196--Gyroscopic action explained, p. 197--Why does the spinning wheel exert gyroscopic power? p. 199--Mr. Brennan's model car, p. 200--The "wabble" of the gyroscope explained, p. 202--How the Brennan gyroscopes work, p. 203--Technical explanation of the gyroscope, p. 204--The evolution of an idea, p. 213--Sir Henry Bessemer's experiment, p. 214--What may be expected of the gyrocar, p. 215. CHAPTER VIII THE GYROSCOPE AND OCEAN TRAVEL Bessemer's costly experiment, p. 217--Dr. Schlick's successful experiment, p. 219--The action of Dr. Schlick's invention explained, p. 220--Did gyroscopic action wreck the _Viper_? p. 222--Theoretical dangers of the gyroscope, p. 223--Probable use of the gyroscope on battleships, p. 225. CHAPTER IX NAVIGATING THE AIR