| Year | 1928 |
| Date | 03-May |
| Volume | 58 |
| Issue | 1,408 |
| Page | 422 |
| Category | General |
| Part | |
| Title | Models as an Aid to Invention |
| Author | Percival Marshall |
| Notes | Lecture given to the Institute of Patentees on Thursday, April 26, 1928. What is a model? Historical inventors' models, the birth of an invention, the difference between models and reality, simple models, demonstration models |