1938-39 a laboratory course in air conditioning was introduced. The first extension course in industrial air conditioning was given in Detroit in 1939-40. In this year arrangements were also made to offer an elective course in metallurgy for students in mechanical engineering. At about the same time the courses in internal combustion engineering were expanded, and arrangements were made for an Internal Combustion Engine Institute in the summer of 1940.
Hawley was made acting chairman of the department in 1939, and, after the death of Emswiler in 1940, he was appointed to the chairmanship. Ransom Smith Hawley ('07e [E.E.], M.E. '15) came to the University of Michigan from the Colorado School of Mines in 1917. He became Professor of Mechanical Engineering in 1920 and served until his retirement in 1951. Professor Edward Thomas Vincent (London '21) succeeded as the chairman. Before coming to the University in 1936-37 he had been chief engineer for the Continental Motors Corporation in Detroit. Harry James Watson (Ohio State '15e [M.E.]), appointed Instructor in 1916 became Assistant Professor in 1921. Clarence Frank Kessler ('19e [M.E.], M.S.E. '24) joined the staff as Instructor in 1920, becoming Associate Professor in 1943. Floyd Newton Calhoon (Louisiana State '16, M.S. Michigan '35), who became Instructor in 1923, was made Professor in 1952. Charles Willett Spooner, Jr. (M.E. Cornell '34, M.S. Michigan '35) was added to the staff as Instructor in 1936; he transferred to Naval Architecture and Marine Engineering in 1945.
In 1937-38, 419 students were enrolled in the department; in 1948-49, 1,219; and in the second semester of 1951-52, 309 in mechanical engineering and 98 in mechanical and industrial engineering. Facilities of the Engineering College were taxed to the utmost after World War II, and it was only by greatly increasing the number of students in each section that instruction could be carried on. From 1940 to 1942 Hawley conducted a study of the curriculum that led to the introduction of an orientation course at the sophomore level, and a revision of the mechanism and design courses.
In addition to the regular work of the department, special extension courses, special courses for military groups, and courses for training civilians as factory production inspectors were given. The full-length summer term was introduced in 1942. In 1943 the Army Specialized Training Program was begun, and the Navy program was set up. The A.S.T.P. was discontinued in April, 1944, but the Navy program did not terminate until more than a year later.
In the fall of 1947 a new program was adopted that increased the time devoted to thermodynamics and electrical engineering, broadened the requirements in technical applications courses, and decreased the time devoted to metal processing and surveying. A senior course in process equipment design was offered in the fall of 1945, and the industrial air-conditioning extension course was adapted to the regular program in the second semester of 1947-48. Additions to the senior level courses include Industrial Exhaust and Ventilation Laboratory, and Rocket Motors, first offered in the second semester of 1951-52.
Service courses in heating and air conditioning were also given for students in the College of Architecture and Design and in heat-power engineering for students in chemical and metallurgical engineering.
The manner of conducting laboratory work has changed greatly since 1882, when little equipment was available and the work was more or less impromptu. In addition to the regular instruction, among the many experiments carried
