Flour Mills on European Rivers

The Journal of Sacred Literature By John Kitto, Henry Burgess, Benjamin Harris Cowper: ""

This text implies the presence of flour mills on the Tibur in the nineteenth-century. It is my sense that flour mills floated on all European rivers where they flowed through cities. Any documentation regarding floating mills would be appreciated. I know about the paintings of the Seine with mills at the Carnavelet museum in Paris, but that is about it. 

Thanks.