March 19, 1842: Thomas M. Drown is born.Drown was known as a chemist and metallurgist and he was the fourth President of Lehigh University. “In the 1880s, Drown held a leadership post in chemistry at the Massachusetts Institute of Technology. He helped start MIT’s chemical engineering curriculum in the late 1880s. In 1887, he was appointed by the newly-formed Massachusetts Board of Health to a landmark study of sanitary quality of the state’s inland waters. As Consulting Chemist to the Massachusetts State Board of Health, he was in charge of the famous Lawrence Experiment Station laboratory conducting the water sampling, testing, and analysis. There he put to work the environmental chemist and first female graduate of MIT, Ellen Swallow Richards. This research created the famous “normal chlorine” map of Massachusetts that was the first of its kind and was the template for others. As a result, Massachusetts established the first water-quality standards in America, and the first modern sewage treatment plant was created.”
Commentary: Drown taught all of the famous engineering graduates from MIT who we revere today—George Warren Fuller, George C. Whipple and Allen Hazen (chemistry courses). Below is the Normal Chlorine Map from a book by Ellen Swallow Richards. It shows that chloride concentrations in ground and surface waters increase as one nears the coastline of the Atlantic Ocean. Any significant deviations from the “normal” levels of chloride in a water source indicated sewage contamination.