Dry-Docks, etc. 



Blackboard Drawing- of a floating- Dry-Dock. Water let into 

 dock, -which sinks to receive vessel. 



26. A dry-dock is one from which the water 

 may be shut out or pumped out. 



27. Some dry-docks are floating docks like 

 that shown in the chart and in the blackboard 

 drawing. Such have cisterns or hollow spaces 

 between their sides or under the floor, into 

 which water is admitted until the dock sinks 

 deep enough to admit a vessel needing repairs. 





Blackboard Drawing- of a floating 1 Dry-Dock. Water pumped 

 out of dock, causing dock to rise, lifting the vessel. 



28. When the vessel is properly braced or 



