Photograph by Central News Photo Service 



ON GUARD ABOVE A BATTLESHIP AT ANCHOR IN HOME WATERS 



An important advantage which the airplane or captive balloon enjoys in the role of a 

 lookout is the fact that an observer high above the sea can easily detect the shadowy presence 

 of a submarine beneath the waves, whereas the sinister craft may be entirely invisible to one 

 on the deck of a threatened warship. 



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