Originally 33 fountains were inserted along the length of the dock boundary wall in 1859. Fountains were located on both sides of the wall although the above example is on the outside
I have seen two types of fountain constructed out of either granite or cast iron as the photograph. I have also read that the fountains were installed to provide drinking water to the dock workers in the hope that this would keep them out of the pubs, how effective this was in practice would be interesting to know.
Whether this worked effectively or not the fountains would have supplied drinking water to people working in and around the docks, they are certainly a remnant of a bye-gone era.