| Year | 1921 |
| Date | 19-May |
| Volume | 44 |
| Issue | 1,047 |
| Page | 391 |
| Category | Workshop |
| Part | 3 |
| Title | Precision |
| Author | |
| Notes | Classification, Choice, Construction and Setting Out Jigs and Fixtures. A "jelly plate" or floating table, Morse socket floating tool-holder, toolmaker's buttons |