WD+Timeline

Timeline __**
 * __


 * 1774 || Carl William Scheele discovered chlorine ||
 * 1814 || Sir Humphrey Davy discovered chlorine dioxide ||
 * 1854 || Dr. Snow showed that cholera was transmitted through water and developed initial principals of epidemiology ||
 * 1860s || Sand filtration was used to clean water from diseases ||
 * 1870s || Pasteur and Koch developed the germ theory eventually leading to innovations in microbiology. ||
 * 1881 || Koch learned that chlorine kills bacteria in water. ||


 * 1890 || First electrolytic chlorine generation plant was built in West Germany. ||
 * 1905 || Continuous chlorination was used for the first time in England, preventing a typhoid epidemic. ||
 * 1908 || The first time disinfecting water was used in the United States was at the Bubbley Creek Filtration Plant in Chicago. ||

Waterborne Diseases WD Webquest Questions