A TRAINLOAD OF AMERICAN MINES PROCEEDING TO THE EMBARKING QUAY 



The big steel bubbles strewn about in the foreground are each filled with 300 pounds of TNT, 

 one of the most powerful explosives used during the world war. 



TRANSFERRING MINES FROM RAILROAD CARS TO LIGHTERS 



A mine, shaped like a ball or an egg, is about one yard in diameter. With its iron box anchor, 

 two feet square, and its wire mooring cable, it weighs 1,400 pounds. 



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