xxii 



INDEX 



Thacher bar. 255, 259. 



bar, Table of properties of, 



259. 

 Thermal changes in concrete, 



Effect of, 238. 

 Tie-bar, 250. 

 Column, 250. 

 -locked wire fabric, 267. 

 Wall forms with wire, 



338. 



Time-of -setting test, 221. 

 -of-setting test, Results of, 



223. 



Ton weight, Table of long-, 3. 

 Transverse strength of con- 

 crete, Table of, 284. 

 strength of various ma- 

 terials, Table of, 283. 

 Trapezium, Area of, 51. 

 Trapezoid, Area of, 51. 

 Triangle, Area of, 51. 

 Dimensions of, 50. 

 9f forces, 89. 



Triangular-mesh wire rein- 

 forcement, 268. 

 Troy weight, 3. 

 Trussed bar, Kahn, 260. 



bars, 250. 

 Trus-Con bar, 261. 

 Trusses, Weight of roof, 56. 

 Trussit reinforcement, 267. 

 Twisted bars, Square-, 256. 

 lug bar, Square-, 257. 

 lug bar, Table of proper- 

 ties of square-, 258. 



U 



U bar, 263. 



Ultimate elongation, 124. 



strength, 124. 



strength of concrete, 241. 



strength of metals, Table 

 of, 126. 



strength of wood, Table 



of, 128. 



Uniform load, 100. 

 Unit bar, 255. 



socket, 328. 



strain, 122. 



stress, 122. 



system of reinforcement, 

 277. 



Unit working values of con* 

 crete allowed by vari- 

 ous cities, 240. 



Universal bar, 258. 



bar, Table of properties of, 

 259. 



V 



Velocity and force of wind, 



Table of, 82. 

 Vertical shear, 104. 

 Vibration on concrete, Effect 



of, 238. 



Vicat needle, 222. 

 Visintini reinforcement, 281. 

 Voids, Definition of, 230. 



Percentage of, 197. 

 Volume, Constancy of, 210. 

 Measure of, 5. 

 of cement, Constancy of, 



229. 



of circular ring, 53. 

 of cone, 53. 

 of cylinder, 52. 

 of frustum of cone, 53. 

 of frustum of cylinder, 



53. 



of frustum of prism, 55. 

 of frustum of rectangular 



pyramid, 54. 

 of parallelepiped , 55. 

 of prism, 55. 

 of prismoid, 53. 

 of rectangular pyramid, 



54. 



of sphere, 53. 

 of wedge, 53. 



W 



Wall forms, Braces for, 341. 

 forms, Spandrel, 341. 

 forms with clamp bolts, 



338. 



forms with wire ties, 338. 

 Walls, Laws for, 361. 

 Water for concrete, 236. 

 Waterproofing, Barrett spe- 

 cifications for, 345. 

 by adding lime or clay, 



343. 

 Cements for, 344. 



