July 25, 1698: “Thomas Savery received a British patent for a “New Invention for Raiseing (sic) of Water and Occassioning Motion to all sorts of Mill Work by the Impellent Force of Fire”; first application of steam for pumping water, intended for draining mines, serving towns and supplying water to mills; design had major problems containing high-pressure steam due to the weakness of available construction materials.”
July 25, 1799: James Simpson born. Simpson is one of the best-known filtration pioneers. He developed, built and put into operation the first slow sand filter in England. The filter was part of the Chelsea Water Works Co. which served part of London.
Reference: Baker, Moses N. 1981. The Quest for Pure Water: the History of Water Purification from the Earliest Records to the Twentieth Century. 2nd Edition. Vol. 1. Denver, Co.: American Water Works Association, 99.