| Year | 1934 |
| Date | 26-Apr |
| Volume | 70 |
| Issue | 1,720 |
| Page | 393 |
| Category | Workshop |
| Part | |
| Title | The Case-Hardening of Steel |
| Author | |
| Notes | Mild steel bar specially fractured to show hard outer case and tough core, skin hardening, case-hardening proper, pack-hardening, Durapid process, cyaniding |