INDEX 



xv 



Natural cement, 194. 

 Needle, Vicat, 222. 

 Negative and positive mo- 

 ments, 94. 



shear, Positive and, 105. 

 Neutral axis, 97, 143. 



axis by means of the prin- 

 ciple of moments, Lo- 

 cating, 97. 

 New, Joining of old concrete 



with, 247. 



Normal consistency, 216. 

 tests, 211. 



wind pressure, Table of, 

 83. 



O 

 Old and new work, Joining, 



247. 



Operation of mixers, 354. 

 Ordinarily hydraulic lime, 



194. 



Outside columns, Spread 

 footings for, 315. 



Package for cement, 228. 

 Paraffin for waterproofing, 



344. 

 Parallelogram, Area of, 51. 



of forces, 88. 

 Parallelepiped, Surface of, 



55. 



Volume of, 55. 

 Percentage of voids, 197. 

 Perimeter of ellipse, 51. 

 Philippine wood, Table of 



weights of, 79. 

 Pin-connected girder frames, 



277. 



Pit sand, 197. 

 Plain bar iron, 254. 



concrete, 230. 

 Plane figures, Center of 



gravity of, 96. 

 Plank, Forms constructed of, 



334. 



holders for forms, 340. 

 Polygons, Regular, 55. 

 Poor lime, 193. 

 Portland cement, 194. 



cement, Specifications for, 



227. 



Positive and negative mo- 

 ments, 94. 



and negative shear, 105. 

 Post, Long, 181. 

 Short, 180. 



Table of constants for a 

 rectangular wooden, 

 184. 



Wooden, 179. 



Powers, roots, and recipro- 

 cals, 31. 



Preparation of sand, 199. 

 Pressure, Table of normal 



wind, 83. 



Primary tests, 210. 

 Principal dimensions of 



standard T rails, 166. 

 Prism, Surface of, 55. 

 Volume of, 55. 

 Volume of frustum of, 55. 

 Prismoid, Volume of, 53. 

 Properties and principal 

 dimensions of standard 

 T rails, 166. 



of rolled steel shapes, 146. 

 of sections, 129. 

 of standard angles having 



equal legs, 154. 

 of standard angles having 



unequal legs, 158. 

 of standard channels, 151. 

 of standard I beams, 148. 

 of T bars, 164. 

 of Z bars, 162. 

 Property, Elastic, 123. 

 of cement, 195. 

 of concrete, 237. 

 of sand, 197. 

 Proportion of materials, 



Usual, 235. 

 Proportioning by weight, 



235. 



of ingredients, 234. 

 Proportions of ingredients 



for concrete, 244. 

 Protection of cement, 229. 

 Purpose and classification of 



cement tests, 210. 

 Puzzolan cement, 194. 

 Pyramid, Surface of frus- 

 tum of rectangular, 54. 

 Surface of rectangular. 54. 



