BodgeIt wrote:

wrote:

the question arose as to how barges crossed in
the old days when there was only one path for the horse and draw
rope?

http://www.canaljunction.com/craft/horsedrawn1.htm

They could do with borrowing the photo of the stone roving bridge from
wikipedia in the section explaining how the horse stays in harness where
the towpath changes side.

http://en.wikipedia.org/wiki/Roving_bridge