2o8 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



cylinders was used as a well in which a 13-inch centrifugal pump 

 was fixed. From this well were led three lines of 9-inch open- 

 jointed spigot-and-faucet pipes, with side branches as required, 



I 



FIG. 193. 



to give free passage to every spring of water met with. The 

 pipes laid under the sill were cast iron, and the remainder, 



which extended to the upper end of the dock, were fire-clay. 

 They were laid in trenches under the foundations at an inclina- 



