| Year | 1952 |
| Date | 31-Jan |
| Volume | 106 |
| Issue | 2,645 |
| Page | 140 |
| Category | Workshop |
| Part | |
| Title | Socket Screws in the Workshop |
| Author | S.F.Herridge |
| Notes | The Lindley extensometer (photo by courtesy of J.E.Baty & Co.), materials, tests, unusual devices, selecting keys, interchangeabilty of wrenches, extracting broken taps, materials and finish |