A dredger is used to remove the mud, silt, and other deposits from the bottom of harbours, canals, rivers, docks, etc.

The steam dredging-machine
The steam dredger has a succession of strong iron buckets on an endless chain. It was worked by steam, and the buckets tore up the matter at the bottom, raised it, and discharge it into punts or hoppers close to the dredging vessel.

Canal boats were once used to carry cargo from one town to another.

Paddle Steamer
A paddle steamer is a ship or boat driven by a steam engine that uses one or more paddle wheels to move forward with.

Paddle wheel
 
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