| Limiting lengths of continuous steel stringers | 227 | | |
| Limit of working-stress | 8 | | |
| Limits in bridge-designing | 160 | 226 | 227 |
| Limits of errors for graphics | 335 | | |
| Links for toggles of draw machinery | 208 | | |
| List of data for spans | 332 | | |
| Live and dead loads, comparative importance of | 7 | | |
| Live loads for cantilever bridges | 60 | 61 | |
| Live loads for combined bridges | 136 | | |
| Live loads for draw-spans | 183 | | |
| Live loads for elevated railroads | 91 | 151 | |
| Live loads for highway bridges | 221 | | |
| Live loads for railroad bridges | 151 | | |
| Loads for draw-spans | 183 | | |
| Loads for highway bridges | 221 | | |
| Loads for piles in cylinders | 313 | | |
| Loads for railroad bridges | 150 | | |
| Locating piers during sinking | 326 | | |
| Location of base-lines | 321 | 322 | |
| Location of structure as affecting its decoration | 46 | | |
| Long panels | 51 | | |
| Long sights in triangulation | 323 | | |
| Long steel tape, measurements with | 319 | | |
| Loop-eyes | 178 | | |
| Loose rivets | 255 | | |
| Lower-chord packing | 176 | | |
| Lower lateral systems of highway deck-bridges | 219 | | |
| Lower lateral systems of railroad deck-bridges | 219 | | |
| Lower tracks of turntables | 194 | | |
| Lubricating sliding and rolling surfaces | 289 | | |
| Lump-sum bids | 2 | | |
| Machinery for drawbridges, care of | 129 | | |
| Machinery for draw-spans | 201 | | |
| Machinery for Halsted Street Lift-Bridge | 111 | | |
| Machinery-houses for draw-spans | 211 | | |
| Main central spans of cantilever bridges, stresses in | 59 | 60 | |
| Main members of highway truss-bridges | 218 | | |
| Main members of railroad truss-bridges | 146 | | |
| Making detail drawings, method of | 337 | | |
| Making drawings | 335 | | |
| Man-power machinery | 128 | | |
| Man-power operating apparatus for Halsted Street Lift-Bridge | 112 | | |
| Man-power operating machinery, necessity for | 202 | | |
| Margin lines for drawings | 339 | | |
| Mask of ornamental cast iron | 42 | | |