Note on back of photograph: "Dr. John Postlethwaite, Associate Professor of Chemistry and Chemical Engineering, uses electro-chemical apparatus to measure corrosion rates in a section of iron pipe carrying potash in water. The pipe under study is in a flow loop which also contains transparent sections so that interior conditions can be observed." In Thorvaldson lab.

Bio/Historical Note: Dr. John Postlethwaite was on the faculty of Chemical Engineering from 1975-1983.