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Feb: Peened surfaces improve endurance of machine parts; mechanical causes of fatigue; surface vulnerable to fatigue; surface compression to improve strength; measuring pre-stressed layer. May: Examples of fatigue failures in common machine parts; bolt failures; elastic movements in crankshafts; elasticity in gear trains; pitting of gear teeth. Aug:It is claimed that fatigue data obtained from tests on carefully prepared laboratory specimens may have little bearing on fatigue characteristics of machine parts made from same material; in published data, several assumptions are made which are not justified in practical design; even if stress could be determined, fatigue data from laboratory specimens could not be used. Sept: Endurance of machines under few heavy loads. Before Detroit Chapter, Am Soc Metals, Nov 1942. (See also - n 3 Feb 1 1943 p 28-32, 84; Metal Progress v 43 n 2, 5, Feb 1943 p 209-15, 270, May p 737-40, v 55 n 2, 3, Aug 1943 p 254-61, Sept p 435-40; Steel v 112 n 10, 14, Mar 8 1943 p 88-9, 132-6, Apr 5 p 112, 146-9)