| Year | 1999 |
| Date | 27-Aug |
| Volume | 183 |
| Issue | 4,101 |
| Page | 265 |
| Category | Internal Combustion |
| Part | 1 |
| Title | Otto & Langen Atmospheric Gas Engine |
| Author | Herbert Stumm (Germany) |
| Notes | Describes the model. A new design, research, construction, flywheel, column and slide valve, piston and guide bars, plummer-blocks |