| Year | 1918 |
| Date | 11-Apr |
| Volume | 38 |
| Issue | 885 |
| Page | 228 |
| Category | Practical Letters from Our Readers |
| Part | |
| Title | Two Useful Hints from France |
| Author | Sapper C.V.Barin, R.E. |
| Notes | Guiding device for filing square or hexagon bolt heads, method of increasing grip on mandrel pulley |