Derelict Shot Tower or Fire Watch Tower

Took a walk along the Crane river today and found many earthworks and the remains of buildings which belonged to the Hounslow Gunpowder Works.  There were millstones which were used to incorporate the ingredients of gunpowder - sulphur, saltpetre and charcoal.
The Works opened in the late 1760s in what is now the western end of Crane Park. Crane Park Island was created to provide a mill pond for the water to drive the machinery. There were many explosions and the Shot Tower is now thought to have been a watch tower for fire rather than a shot tower for making lead shot. The licence to manufacture gunpowder was withdrawn in 1927, and part of the site was sold to Twickenham Council, which turned it into Crane Park. This opened in 1935, and was inherited by Richmond Council when Twickenham Council was abolished in 1965. The Shot Tower (now officially the Brick Tower) is a Grade 11 listed building    Wiki