24 



The National Geographic Magazine 



Side View of Mabel II 



A floating kite supported upon three boat-like floats formed of tetrahedral cells and covered com- 

 pletely with oil-cloth. In September, 1903, this kite was raised into the air by being towed by 

 a steamboat against the wind 





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Photos by Gilbert H. Grosvenor 



Mabel II Outlined against Sky showing Bird-wing Effect 



For experiments with this kite see "The Tetrahedral Kites of Dr Alexander Graham Bell," by 

 Gilbert H. Grosvenor, Popular Science Monthly, December, 1903 



