| Masonry, bearings upon | 156 | |
| Masonry, inspection of | 294 | |
| Masonry piers | 305 | |
| Materials for draw-spans | 182 | |
| Materials for highway bridges | 213 | |
| Materials in railroad structures | 141 | |
| Materials, specifications for | 243 | |
| Mathematical demonstration of economic span length | 34 | |
| Mattresses around piers | 314 | |
| Measurement of angles | 323 | |
| Measurements on the ice | 318 | |
| Measurements with long steel tape | 319 | |
| Measure of strength of structure | 16 | |
| Mechanical-power turning-machinery, formulae for | 203 | |
| Medium steel, reason for using | 8 | |
| Memphis Bridge | 68 | |
| Menominee Canal bascule bridge at Milwaukee | 107 | |
| Metal | 244 | |
| Metal-work for timber trestles | 279 | |
| Method of checking finished design | 29 | |
| Method of determining power required for operating and lifting draws | 202 | |
| Method of making detail drawings | 337 | |
| Method of measuring with steel tape | 319 | |
| Method of utilizing equivalent loads | 267 | |
| Methods of operating revolving draw-spans | 120 | |
| Methods of pier-sinking | 301 | |
| Methods of study of aesthetics in any bridge design | 49 | |
| Methods of testing | 246 | |
| Metropolitan Elevated bascule bridge, Chicago | 106 | |
| Minimum fees for professional work | 284 | |
| Minimum thicknesses of drums | 194 | |
| Minimum thickness of metal in highway bridges | 226 | |
| Mistakes of construction | 12 | |
| Mixing concrete | 293 | |
| Modern bridge an offence to the landscape | 41 | |
| Moments on pins | 157 | |
| Movable bridges in general | 103 | |
| Multiple systems of cancellation | 18 | |
| Multiple-track structures, bracing frames in | 25 | 26 |
| Name-plates | 150 | |
| Name-plates, specifications for | 259 | |
| Necessity for allowance for variation in pier-sinking | 316 | |
| Necessity for bridge specialist | 3 | |
| Necessity for complete data | 18 | |
| Necessity for experiments on impact | 17 | |