| Sand-briquette tests | 296 | | |
| Scales for drawings | 335 | 342 | | |
| Scientific detailing, importance of | 139 | | |
| Screws for draw-span machinery | 207 | 208 | | |
| Sectional areas of web members for open-webbed, riveted girders | 27 | | |
| Sections and section lines (drawings) | 341 | | |
| Sections for columns of elevated railroads | 94 | | |
| Sections of compression flanges of plate girders | 107 | | |
| Sections of lateral struts | 171 | | |
| Sections of members for highway bridges | 228 | 229 | | |
| Sections of members of elevated railroads | 180 | | |
| Sections of top chords and inclined end posts | 170 | | |
| Sections of transverse struts | 171 | | |
| Sections of vertical posts | 171 | | |
| Sections of web-stiffening struts | 171 | | |
| Semi-cantilevers | 62 | | |
| Sense of fitness, inherent | 14 | | |
| Sewers, removal of | 291 | | |
| Shafting | 205 | | |
| Sheared edges | 254 | | |
| Shimming-plates for draw-spans | 210 | | |
| Shipping metal | 261 | | |
| Shipping timber | 299 | | |
| Shipping weight | 252 | | |
| Shipping weights, checking of | 280 | | |
| Shoeing piles | 278 | | |
| Shoe plates | 177 | | |
| Shoes and end-bearing rollers for draw-spans | 209 | | |
| Shop-drawings | 243 | 337 | 343 |
| Simple truss-spans erected by cantilevering | 76 | | |
| Simplicity in designing | 13 | | |
| Single concentrated load method | 266 | | |
| Sinking caissons | 292 | | |
| Sinking piers | 315 | | |
| Sinking piers into bed-rock | 312 | | |
| Sioux City Bridge | 135 | | |
| Sioux City Bridge triangulation | 324 | | |
| Sizes of drawings | 335 | 344 | | |
| Sizes of pedestals for elevated railroads | 181 | | |
| Skew-bridges, avoidance of | 18 | | |
| Skinning structures | 3 | | |
| Slabs | 245 | | |
| Slide-rule, use of | 333 | | |
| Sliding feet for columns | 179 | | |
| Smooth track for elevated railroads | 101 | | |