314 



STRENGTH OF MATERIALS 



Steel, modulus of elasticity of, 243. 



nickel, 241. 



open-hearth process, 239. 



specifications for, 2-14. 



strength of, 240, 241. 

 Steel and concrete. See Reenforced <-<>n- 



crete. 



Stone. See Limestone and Sandstone. 

 Straight-line formula, 268. 

 Straight-line law, 35. 

 Strain, defined, 2. 



diagrams, 4, 233, 236, 261, 287. 



equivalent, 31. 



measure of, 31. 

 Strength of materials, average values, 



18, 19. 

 Stress, defined, 2. 







maximum normal, 23. 



trajectories, 69. 

 Stresses, equivalent, 31. 



in different directions. L"J 



temperature. 12. 1>*X. 194. 

 Structure of timber, 282. 

 Struts and columns, 98. 

 SUUMI- maple, Strength of, j 

 Sulphur in iron and 240. 



t gum, strength of, 290. 

 Sycamore, strength of 

 System of equivalent forces, 38. 



Tamarack, strength ..f, 290. 

 Temperature, effect on strength of steel, 

 22 . 



8trrs.-. I'-'. 188, 194. 

 Tension define* i 



Tensile strength, average values, 18. 

 Tensile tests, 218. 



of beltin-. 



of cast iron, 232, 238. 



of cement, 251. 



of rope, 303. 



of steel, 240, 241,242. 



of timber, 289. 



of wire rope, 300, 301, 302. 



of wrought iron, 24 1 

 Tenth census timber tests, 290. 

 Test pieces. lan:e and small. 224, 296. 

 Test specimens, standard forms of, 244. 

 Theorem of three moments, 80. 

 Theorems on moment of inertia. 38. 

 Theory of flat plates. 1 :'.". 



Theory of flexure, common, 34. 

 Thick hollow cylinders. See Cylinders. 

 Thickness of retaining \\alls. 212. 

 Thin hollow cylinders. See cylinders. 

 Timber, annual rings, ^^^. 



moisture in, 283. 



results of tests, 290, 292, 293, 295, 

 WO. 



sapwood and heart wood, 283. 



strength of, 283, 384. 



structure of, 282. 

 Time effect, 9. 

 Tool steel, 

 Torsion, and bend ing combined, 32, 1 \-'>. 



angle of twist, 113, 119, 226. 



as test for shear, 2: 



circular shafts in, 112, li::. in. 



elliptical shafts in. 118. 



maximum stress in circular 

 in. 112. 

 -circular .shafts in. 1 17. 



rectangular and square >i.a: 

 118. 



resil. rcular shafts in. 117. 



test specimen, 228. 



u'ular shafts in. 1 1 1 .*. 

 Transverse tests. See Flexure. 



Ultimate strength, defined, 6, 7. 

 average values for, 18, 19. 



Unit stress defin* 



tl reaction and shear, 47. 



Wellington's formula, 200. 

 Winkler's criterion for stability, 177. 



Wire rope. See / 

 Wood. See Timber. 

 Work, defined. B <nce. 



Work of deformation of beams, 83. 

 Wrought iron, manufacture and proper- 

 ties. 



impurities in. 



modulus of el: i 



specifications for, 24 1 



Yield point defined, 6, 222. 

 Young's modulus, 6. 



> for, 18. 



