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Our Surroundings 



Keystone View Company. 



A STREAMLINED AIRPLANE 



This French monoplane flew from Paris to South America and back. Notice the 

 raindrop-shaped guards over the wheels to cut down air resistance. 



Following the invention of the airplane, men began to pay 

 more attention to the question of air resistance. Wind tunnels 

 were built large tubes through which a powerful blast of air 

 could be forced by a motor-driven propeller. In the wind tunnels, 

 tests were carried out to see what shape an airplane should have 

 in order to offer the least resistance to the air. It was discovered 

 that a raindrop shape, with a rounded front and a tapering rear, 



Brown Brothers. 



A STREAMLINED RACING CAR 



This automobile is designed to travel more than two hundred miles an hour. Notice 

 the rounded front and tapering rear, which greatly reduce air resistance. 



