UNIFORM WITH THIS WORK 



DISCOVERIES AND INVENTIONS OF 

 THE TWENTIETH CENTURY 



BY EDWARD CRESSY 

 With 281 large Illustrations 



The Revival of Water Power ; Coal, Gas, and Petroleum ; Gas, Petrol, 

 and Oil Engines ; Generation and Transmission of Electricity ; Electric 

 Lighting and Heating ; Speed and Economy in Factory and Workshop ; 

 Foundry and Forge ; Electric Furnace ; Artificial Production of Cold ; 

 Soil and Crops ; Railways ; Electric Traction ; Motor-Cars ; Modern 

 Ships ; Conquest of the Air ; Wireless Telegraphy ; Ships of War and 

 their Weapons ; Applications of Photography ; Radium, Electricity, 

 and Matter. Index 



