Maesbury Marsh - former bone works (1987)
This is a rare example of a 19th century superphosphate works that used the process patented in 1842 by Sir John Lawes (1814-1900) in which bones (or, where available, coprolites) were ground and mixed with sulphuric acid, at first in brick-lined pits, to produce superphosphate (calcium dihydrogen phosphate). There were about 80 small works in Britain by 1870, of which six were in Shropshire. The mill at Maesbury is the only one of which there are substantial remains. It was established about 1860 by Edward Richards, and continued in production until the early 1890s when the business moved to Rednal. (4 August 1987)