| Year | 1924 |
| Date | 27-Mar |
| Volume | 50 |
| Issue | 1,196 |
| Page | 355 |
| Category | The Model Engineer and His Laboratory |
| Part | 4 |
| Title | Hardness and its Relation to Tensile Strength |
| Author | A.H.Stuart |
| Notes | Simple device for measuring small diameter, ball-holder for testing steels, graduated tapered slot for measuring ball impressions |