Secret Gasoline Supplies for Submarines 



A submarine at sea can replenish its supply of gasoline or oil by means of the device 

 illustrated. Within an outer container, a tank of gasoline or oil is placed. Between 

 the outer container and the gasoline tank is a space filled with water. When the 

 water is forced out by compressed air, container and tank rise to the surface 



A float hidden in seaweed conceals the means of raising the tank to the surface. 



After the tank has been brought to the surface the submarine proceeds to replenish 



its supply of fuel by the simple expedient of pumping it into its reservoirs 



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