| Year | 1950 |
| Date | 20-Apr |
| Volume | 102 |
| Issue | 2,552 |
| Page | 570 |
| Category | Workshop |
| Part | |
| Title | Notes on Grinding Wheels |
| Author | M.Hall |
| Notes | A diamond tool for re-truing grinding wheel, chaecking speed, selection of grinding wheels, speed of the wheel, grinding allowance, storing wheels |