| Protecting column feet | 291 | |
| Protecting hubs | 320 | 321 |
| Provision for clearance in packing | 24 | |
| Provision for effect of impact | 16 | 17 |
| Provision for expansion and contraction | 23 | |
| Provision for factor of ignorance | 7 | |
| Provision for thrust transference | 26 | |
| Pull-back draws | 104 | |
| Punching, accuracy in | 254 | 287 |
| Punching and reaming | 256 | |
| Quality of stress, consideration of | 22 | |
| Quarry-bed | 297 | |
| Quarry-sap | 297 | |
| Quenching | 248 | 249 |
| Racks for turning draw-spans | 198 | |
| Radial struts for drums | 193 | |
| Rail inspection | 290 | |
| Rail lifts for draw-spans | 208 | |
| Railroad structures, specifications for | 141 | |
| Rails for elevated railroads | 93 | |
| Raising column feet | 181 | |
| Raising column feet of elevated railroads | 101 | |
| Ratio of length to least radius of gyration | 160 | |
| Ratio of working intensity to elastic limit | 8 | |
| Ratios of length to least radius of gyration in highway bridges | 227 | |
| Ratios of truss-depth to span-length | 32 | 33 |
| Ratios of weights of cantilevers and fixed spans | 75 | |
| Reaming | 256 | |
| Reaming, necessity for | 9 | |
| Reasons for lack of aesthetic treatment in American bridge designs | 39 | |
| Reasons for unsatisfactory conditions in existing elevated railroads | 24 | |
| Reasons for using medium steel | 8 | |
| Recording of combinations of stresses | 334 | |
| Recording of wind stresses | 334 | |
| Recording progress of shop-work | 280 | |
| Red Rock Bridge piers | 307 | |
| Red Rock cantilever bridge | 64 | 68 |
| Reduction of area | 248 | |
| Reduction of field-riveting to a minimum | 24 | |
| Redundant members, objections to | 19 | |
| Re-entrant corners | 254 | |
| Referencing hubs | 321 | |
| Reform in bridge-building, aesthetic | 45 | |