| Year | 1940 |
| Date | 19-Dec |
| Volume | 83 |
| Issue | 2,067 |
| Page | 476 |
| Category | Inventionsà Successful and Otherwise |
| Part | 2 |
| Title | A Domestic Heat-Transformer |
| Author | B.C.J. |
| Notes | Sections of portions of heat-absorbing elements, convection currents of hot-air, the problem, section of complete heat-absorbing unit, sectional view of the "transformer" showing relative position of gas-fire, minor details, tests, transformer plan view |