Manufacturing fertiliser, c 1960s.

'Engineers working in the huge rotating cooling drum at the new 2,500,500, fertiliser plant at Albright and Wilson Ltd, Asociated Chemical Companies Division at Barton-upon-Humber in Humberside. It is the first plant in the world to make compound fertilisers by the prilling proces. Droplets are produced by introducing molten material into a spinning 'prilling' bucket at the top of a 218 foot tower. The droplets fall to the bottom and emerge as solidified fertiliser prills.'