1. simplified process for determining steam purity. (u.s. pat. 2,146,312. 2/7/39 steam testing method and apparatus;Powell;trans. am. soc. engrs.,1951
2. steam purity observations at institutional power plants. (u.s. pat. 2,832,673. 4/29/58 apparatus and method for determining steam purity.) proc. 14th annual water conference of engrs;Lane;soc. of western pa.,1953
3. fluoridation by automatic control;Knowlton;water & sewage works.,1955
4. conductivity difference control of chemical coagulation;Babcock;j. am. water works assoc.,1956