The National Geographic Magazine, Volume 111National Geographic Society, 1957 - Geography Indexes kept up to date with supplements. |
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Page 128
... ship herself . To explain : A big ship acts in the canal somewhat like a loose piston going forward in a cylinder of water . As she moves , she pushes water away from her ahead and to the sides . This creates a depression right where ...
... ship herself . To explain : A big ship acts in the canal somewhat like a loose piston going forward in a cylinder of water . As she moves , she pushes water away from her ahead and to the sides . This creates a depression right where ...
Page 130
... ship's progress . The pilot's main task is to give constant advice in effect , orders for the helmsman- to keep the ship in the middle of the channel ( page 129 ) . In view of all these currents , this is more difficult than it looks at ...
... ship's progress . The pilot's main task is to give constant advice in effect , orders for the helmsman- to keep the ship in the middle of the channel ( page 129 ) . In view of all these currents , this is more difficult than it looks at ...
Page 132
... ships may have to tie up in a hurry because of fog or sudden emergency , mooring posts are spaced about every 80 yards along the canal . Each ship must carry one or two boats and crews ready to be lowered and take a line ashore at once ...
... ships may have to tie up in a hurry because of fog or sudden emergency , mooring posts are spaced about every 80 yards along the canal . Each ship must carry one or two boats and crews ready to be lowered and take a line ashore at once ...
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