| Year | 1922 |
| Date | 27-Apr |
| Volume | 46 |
| Issue | 1,096 |
| Page | 411 |
| Category | Testing |
| Part | 6 |
| Title | Precision. Jigs, Fixtures and Wangles |
| Author | |
| Notes | Jig for drilling holes perpendicular to the axix of small round rods, true universal jig for drilling round rods on their diameter |