The evolution of the trading vessels over the last thousand years or more from something based on the Viking long boat to the sailing barge in around 1800 is an interesting one.
The main thing about these barges is that the mast comes down and goes up very quickly to get under bridges, as shown in video
This the next one, which shows you can get an interesting local history book that is over 100 years old for less than a tenner.
Here is the link to our cheap reprints of local books, post free if you can’t get out to look at them in my bookshop http://www.michaelsbookshop.com/id17.htm
And here is the link to my bookshop blog, where we put pictures of the books going out on the shelves for sale every day http://michaelsbookshop.blogspot.co.uk/