| Year | 1903 |
| Date | 30-Jul |
| Volume | 9 |
| Issue | 118 |
| Page | 104 |
| Category | Workshop Notes and Notions |
| Part | |
| Title | Useful Hints for the Amateur |
| Author | J.A.B. |
| Notes | Use chalk on files; hammer cast steel when red hot; harden steel in oil not water; blue steel to prevent rust; softening steel; quench tools in borax; cannot harden steel in water containing ammonia |