| Year | 1922 |
| Date | 17-Aug |
| Volume | 47 |
| Issue | 1,112 |
| Page | 158 |
| Category | Radio Engineering |
| Part | 2 |
| Title | Some Wireless Valve Circuits of 1921 |
| Author | Captain H. de A.Donisthorpe |
| Notes | Investigation of the effect of an Externally Produced Magnetic Field on the Space Occupied by the Three Electrodes of a Triode. Suppression of the Tendency to Oscillate in Amplifying Systems |