Floating Docks 57 



submerged fingers of the dock, and is then 

 raised by pumping out. The dock, with its 

 burden, is then towed alongside one of the 

 series of grids. By careful handling the 

 depositing dock has its fingers inserted 

 between those of the fixed section. Then 

 the water is again admitted to the air- 

 chambers, the depositing dock sinks, leaving 

 the ship on the grid. The depositing dock 

 is then drawn away from the grid, and 

 work is commenced on the ship. 



