Contents v 



FADE 



The Trade Winds The Indian Monsoon. Recording 

 Methods: The Organization of a Meteorological Service Re- 

 cording Instruments Photography Used for Recording 

 Purposes The Stevenson Screen Wind Recording Rain 

 Recording Sunshine Recording Cyclonic Disturbances 

 Clouds Thunderstorm and Hail Weather Lore. 



XXIV. APPLIED SCIENCE. I. THE MARVELS OF ELEC- 

 TRICITY ........ 791 



The Age of Electricity Ease of Transmission What a Cur- 

 rent of Electricity is The Generator Electric Circuits 

 Generating Power Stations Distribution of Current The 

 Storage of Electricity Electric Traction Powerful Electric 

 Motors Big Electrical Feats Climbing the Rocky Moun- 

 tains Electricity from Waterfalls Great Engineering Feats 

 How Water Turbines Work Steam Turbines Importance 

 of Water-Power Electric Lighting Electric Heating. 



XXV. APPLIED SCIENCE. II. WIRELESS TELEGRAPHY 



AND TELEPHONY . . . . . .821 



Progress in Recent Years Theory on which Wireless Tele- 

 graphy is Based Principles of Transmission How Wireless 

 Waves are Received Variation of Wave-Length "Tuning" 

 Wireless Telephony. 



XXVI. APPLIED SCIENCE. III. FLYING . . . 841 



Three Great Flights Weather on the Airways A Landing in 

 Fog Wireless and Civil Aviation Finding the Way in the 

 Air How an Aeroplane Flies What the Pilot Does Stunt- 

 ingWar in the Air The Man and the Machine Airships 

 The Future of Airships How an Airship is Built The 

 Safety of Flying The Future. 



