( >78 ) 
fink empty, and in form refembling the Bell it felf, 
4 might by flexible Pipes, which a man might carry 
coiled on his Arm, receive a conftant Stream of Air 
from the Magazine thereof in the great Bell, fo long 
as the Surface of the Water in the Caps was above 
the Level of that in the Bell. 
Following this Idea, I procured Pipes to be made, 
which anfwered all that was hoped from them. They 
were fecured againft the Preflure of the Water, by a 
fpiralbrafs Wire, which kept them open from end to 
end, the Diameter of the Cavity being about the fixth 
part of an Inch. Thefe Wires we coated with 
thin Glove-leather, curioufly fowed on, and then 
dipt the Leather into a Mixture of Oyl and Bees- 
Wax hot, which, filling up the Pores of the Leather, 
made it impenetrable to Water. Then we drew fe- 
veral Folds of Sheeps Guts over them, which when 
dry, we painted with a good coat of Paint, and then 
fecured the whole with another coat of Leather, to 
keep them from fretting. The Pipes of which we 
made feveral, were much about forty Foot long, 
the fize of a half Inch Rope * the one end thereof 
being fixt in the Bell, at forne height above the 
Water, and the other end faflned to a Cock, which 
opened into the Cap. The ufe of the Cock being 
to flop the return of the Air, whenever there was 
occafion to floop down, or go below the Surface of 
the Air in the Bell, which was neceflary as of- 
ten as there was occafion to go out or return into 
the Bell. 
The Diver therefore putting on his Cap, and 
coyling his Pipe on his Arm, like a Rope, as foon as 
he is difcharged from the Bell, opens his Cock, and 
inarches on the bottom of the Sea, vearing out the 
Coiles 
