Fig. 69. {upper) Tlic signal given, tiie great hollow mass of steel is lifted into the air and 

 overboard. A large tug, the Powerful, is seen, standing by in case our boat should again 

 spring a leak. Fig. 70. {lower) After being lowered to 3000 feet, the bathysphere is brought 

 up again. One hundred feet from the surface it becomes visible. When lifted into the air, the 

 creaking and straining of the machinery shows that something is wrong; the sphere is twice 

 as heavy as it should be. 



