21/05/2026
Before iron ships and modern water ballast tanks were invented in the 19th century, wooden trading ships used stones as ballast to keep the ship stable in the water.
When cargo was unloaded, extra stone ballast had to be added so the ship wouldn’t sit too high and become unstable. When new cargo was loaded, some of the stones were removed to make room and balance the weight properly.
In Weymouth the designated area to load and unload ballast was ‘Ballast Quay’ just below the Nothe. It is shown here on the 1857 Pierse Arthur map, when it would have still been in use.
Stones would be unloaded from one ship and loaded onto another. Of course, if the stock of stone ran low then more local stone would need to be added. On the other hand, if too much stone was accumulated, then it would be sold locally as building material.
As a result, stones were moved all around the world and it is no great surprise that stones from Norway, Greenland, and Newfoundland have turned up at the St Nicholas Street dig site.
(The illustration of the 17th century scene is conjectural and was generated using AI).