| Year | 1953 |
| Date | 23-Apr |
| Volume | 108 |
| Issue | 2,709 |
| Page | 502 |
| Category | In the Workshop |
| Part | |
| Title | An Electric Muffle Furnace |
| Author | "Duplex" |
| Notes | Finishing the casing, the insulating packing, the control unit, estimation of temperature, the pyrometer, making the pyrometer, the meter, calibrating the meter, case-hardening, worm-red, hardeing silver-steel parts |