Laboratory work is given in the second semester of the course and covers a wide range of physical measurement, with particular attention given to the accuracy possible with the apparatus used. _Texts: “Physics”, edited by Duff; Entwisle, “Experiments in Heat, Sound, Light and Electricity”; Entwisle, “Elements of Sound and Light”._ Phys 30 Strength of Materials. Prerequisites: Math 21, Mech 20. The object of a study of Strength of Material is: First, to determine the relations between the external forces acting on a body and the internal forces or stress and between external forces and the deformations or strains, so that the stresses may be determined from known loads or from measured strains or the strains determined from known loads. Second, to obtain a knowledge of those properties of engineering materials necessary to an understanding of these relations. Among the topics covered are stress-strain curves, properties of engineering materials, thin-walled cylinders, riveted joints, combined stresses and strains, torsion, statically determinate and statically indeterminate beams, shear diagrams, moment diagrams, elastic curves, flexure formula, Euler column formula, Gordon-Rankine formula, straight line column formula, repeated loads, fatigue of metals, impact and energy loads, stresses in flat plates, and reinforced concrete beams. An introduction to the use of a handbook is accomplished by instruction in the A. I. S. C. handbook and by the assignment of special problems for solution in class under supervision. In the laboratory, tests are performed to verify the theoretical considerations studied in the classroom work. These include a study of testing machines, tension test of metal, test of riveted joint, compression tests, Brinell hardness, wood tests, strength of cement and mortar, concrete in bond and tension, construction and test of a reinforced concrete beam, slender column tests, torsion in shafts, and stress analysis by means of polarized light. _Texts: Frost, “Laboratory Manual”; Seely, “Resistance of Materials”; A. I. S. C. Handbook._ Transcriber’s Notes A number of typographical errors were corrected silently. Cover image is in the public domain. Dittoes replaced by the words meant to be duplicated.