riLLEROTS SUBMARINE BOAT. 



270 



M. Villeroy, a French engineer, constructed at 

 Philadelphia, a few years ago, a remarkable machine, 

 intended to swim at any depth beneath the surface 

 of the sea that its conductor might desire. This sub- 

 marine vessel was shaped like a cylinder, with conical 



Fig. 55. — N'illi'roy's Subraaiinc Boat. 



ends. It was closed hermetically. It was lighted 

 by a large number of circular windows cut in its iron 

 skin, and closed up with thick glass. A hatchway 

 allowed ingress and egress. Gutta-percha tubes, 

 placed in the interior, communicated with the exterior 



