| Year | 1928 |
| Date | 09-Feb |
| Volume | 58 |
| Issue | 1,396 |
| Page | 126 |
| Category | Electrical |
| Part | |
| Title | The Design of Electrical Gramophone Reproducers |
| Author | Walter Harris |
| Notes | Carbon granule pick-up, original experimental model fitted with diaphragm, modified form incorporating a rubber damper, improved fitted with adjustable magnets, alternative design, reed of reproducer illustrating method of mounting |