SEA LOCK

SN An entrance chamber from tide water to basin, with gates at each end and means of pumping up or lowering the level of water to suit.
CL MARITIME
BT LOCK

 
 

SEA LOCK

SN An entrance chamber from tide water to basin, with gates at each end and means of pumping up or lowering the level of water to suit.
CL TRANSPORT
BT LOCK