| Year | 1921 |
| Date | 06-Oct |
| Volume | 45 |
| Issue | 1,067 |
| Page | 289 |
| Category | Radio Engineering |
| Part | |
| Title | The Method of Plotting the Characteristic Curve of a Triode |
| Author | Captain H. de A.Donisthorpe |
| Notes | Circuit utilised to obtain information, showing curves produced by alteration of anode voltage |