| Year | 1931 |
| Date | 19-Mar |
| Volume | 64 |
| Issue | 1,558 |
| Page | 275 |
| Category | Workshop |
| Part | |
| Title | Laps and Lapping |
| Author | A.T.G. |
| Notes | Internal laps, external laps, means of adjustment, crankpin lap showing method of holding lead lining, simple pin gauge, method of scoring flat laps |