| Year | 1917 |
| Date | 16-Aug |
| Volume | 37 |
| Issue | 851 |
| Page | 97 |
| Category | Workshop |
| Part | |
| Title | On the Principles and Practice of Lapping |
| Author | H.H.Jones |
| Notes | Lapping the stock of a square, effect of liquid on plate showing rounding of corners, circular lap for milling machine or lathe, common lead lap for cylindrical articles, flat copper tube lap, spring lap for holes hole with lip, adjustable circular lap |