The work of this course is divided between a theoretical study of statically indeterminate structures and the design of a variety of small structures. A thorough theoretical study is made of the deflection of beams and trusses and of the methods of least work, slope deflection, moment distribution, and the column analogy. Secondary stresses, space framework and wind stresses in buildings receive their proportion of attention. Throughout the work in theory those structures that are to be later designed and detailed are used for class problems, thereby making a close tie between the theory and design and eliminating an unnecessary amount of duplication in arithmetical calculations. Problems are given in the design of, and complete preparation of plans for roof trusses, buildings, foundations, abutments, retaining walls, trestles, trusses, girders, and frames of concrete, steel, and wood, with a study of timber, riveted, and welded framing. Highway loadings are used in preference to railroad loadings in order to simplify computations. Particular emphasis is placed upon orderly and complete computations, standard and practical considerations of design and detail, and thoroughness and neatness in drafting. Given to senior students in civil engineering. _Texts: Sutherland and Bowman, “Structural Theory, Second Edition”; Caughey, “Reinforced Concrete”; Fuller & Kerekes, “Analysis & Design of Steel Structures”; A. I. S. C., “Steel Construction Handbook”. Certain reference books from a department list to be read during the summer preceding the taking of the course._ CE 30 Structures. Courses CE 30-1 and CE 30-2 will be combined in one senior course in 1940-41 and later years. CE 40 Hydraulics. Prerequisites, Math. 21, Mech. 20. The subject matter is the same as in CE 41. In addition, a laboratory course is given, in which the characteristics of flow are studied for various types of conduits and measuring devices, and also for various degrees of viscosity of the liquid. Given to students in civil engineering. _Texts: Cummings and Widdop, “Elementary Hydraulics”; Laboratory Manual of the Mechanical Engineering Department._ CE 41 Hydraulics. Prerequisites, Math. 21, Mech. 20. This is a text-book and problem course. The subject of hydrostatics is treated briefly, from the point of view of review work in physics and applied mechanics. In hydrokinetics, the energy balances are emphasized as providing means of solving problems in theoretic flow through orifices, pipes, open channels, and over weirs. Constant emphasis is placed on the degree of precision obtainable, in practice, by the use of the available experimentally determined constants to modify theoretical computations to meet actual conditions. Given to chemical, electrical, and mechanical students. _Text: Cummings and Widdop, “Elementary Hydraulics”._