CHAPTER XXVIII. DOCK ENTRANCES, AND LOCKS; AND GRAVING DOCKS.

Tidal Basins leading to Docks. Dock Entrances and Locks compared. Entrances to Docks. Locks leading to Docks. Dimensions of Entrances and Locks for Docks. Construction of Locks. Construction of Dock-Gates. Forms of Dock-Gates. Support of Dock-Gates. Working of Dock-Gates. Caissons in place of Dock-Gates. Graving Docks. Hydraulic Power for Docks. Maintenance of Depth in Docks.