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POPULAR SCIENCE MONTHLY 



Mr. Moore is a strong advocate of the rocket-like form of pro- 

 pulsion for flying machines. He admits that it is wasteful as far as 

 expense is concerned, but contends that it will make a machine go 

 where propellers will fail. He claims that the propeller "is very 

 wasteful of power from friction of the blades in the air, and from 'end 

 stroke,' or currents of air set in motion in the wrong direction." He 

 says further: 



"I have studied and experimented extensively with small aeroplane 



Fig. 10. Steutzel Flying Machine. 



Fig. 11. Langley's Model for studying the Principle.-; of Mechanical Flight. 



Fig. 12. Means's Model. 



machines of every conceivable shape to test their balancing power, and 

 have concluded that it is impossible to build a compact aeroplane 

 machine that will balance and be under control in the air, with present 

 known means. The aeroplane machine of the average inventor con- 

 sists of aeroplanes elevated in various manners, and most of the weight 

 arranged below to give them stability and keep them from upsetting. 



