| Planing-drums | 193 | |
| Plate-girder draw-spans, field-splicing for | 189 | |
| Plate girders, economic depths of | 33 | |
| Pneumatic process | 302 | |
| Pony-truss bridges | 218 | |
| Pony-trusses for elevated railroads | 98 | |
| Portal bracing for railroad bridges | 147 | |
| Portal bracing in high way bridges | 219 | |
| Portals, ornamentation of | 52 | |
| Posts, sections of | 171 | |
| Powdered chalk or talcum | 346 | |
| Power for draw-spans | 120 | 201 |
| Power for operating Jefferson City draw-span | 121 | |
| Power required for operating and lifting draws | 202 | |
| Prejudicial effect of competitive designing | 2 | 39 |
| Preliminary data for elevated railroads | 102 | |
| Preliminary dead load | 333 | |
| Preparation of bed-rock to receive masonry | 291 | |
| Preservation of metal-work | 10 | |
| Pressure on screw-threads | 208 | |
| Prevention of rising ends | 209 | |
| Price for first-class inspection | 288 | |
| Principles of designing | 12 | |
| Principles in designing, adherence to | 4 | |
| Probability of stress application | 22 | |
| Projecting web-plates | 257 | |
| Projection of piles into cylinders | 313 | |
| Proper colors for painting bridges | 53 | |
| Proper conditions for arch bridges | 79 | |
| Proper distance between expansion points in elevated railroads | 95 | |
| Proper kinds of draws for various crossings | 118 | |
| Proper lengths for anchor-spans | 75 | |
| Proper live loads for cantilever bridges | 60 | 61 |
| Proper loads for piles in cylinders | 313 | |
| Proper locations for cantilever bridges | 55 | |
| Proper locations for suspension bridges | 57 | |
| Proper method of letting bridges | 3 | |
| Proper price for first-class inspection | 288 | |
| Proper relations between outline dimensions of spans | 51 | |
| Proportioning details, general principle for | 28 | |
| Proportioning of built members | 174 | |
| Proportioning of pins | 176 | |
| Proportioning turntables of draw-spans | 128 | |
| Proportioning web-angles connected by one leg only | 170 | |
| Proposed association of inspectors | 283 | |