CONTENTS 



couplings, p. 147 — Principle of the Janney coupling, p. 149 — A 

 comparison — the old and the new, p. 1 50. 



CHAPTER V 



PROM CART TO AUTOMOBILB 



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 

 19 10, p. 166 — Comparative speeds of various vehicles and animals, 

 p. 167 — Speed of birds in flight, p. 168 — A miraculous transforma- 

 tion 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 19 10, 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 



