Chapter 20

1. Compare _Mechanical Analysis_. Taylor and Thompson, _Concrete, Plain and Reinforced_, p. 193. 2. H. LeChatelier, Discussion of Paper 1119, A.S.M.E., p. 303. 3. H.L. Gantt, _Work, Wages and Profits_, p. 35. 4. F.B. Gilbreth, _Cost Reducing System_. 5. F.B. Gilbreth, _Bricklaying System_, p. 151. 6. James M. Dodge, Discussion of Paper 1119, A.S.M.E., para. 284. 7. F.B. Gilbreth, _Motion Study_. 8. James M. Dodge. 9. London, _Engineering_, Sept. 15, 1911.

====================================================================