| Year | 1921 |
| Date | 06-Jan |
| Volume | 44 |
| Issue | 1,028 |
| Page | 9 |
| Category | Electronic |
| Part | |
| Title | Recent Developments in Wireless Telephony |
| Author | Arthur R.Burrows |
| Notes | Some Performances and Future Possibilities. Marconi 6 kw transmitter at Chelmsford, C.P.O.S. "Victoria", wireless telephony concert, grid control, modulating valve control |