| Year | 1914 |
| Date | 21-May |
| Volume | 30 |
| Issue | 682 |
| Page | 482 |
| Category | Electronic |
| Part | |
| Title | Condenser Influence Machines and Some of Their Uses |
| Author | V.E.Johnson |
| Notes | Who first invented it? The Wommelsdorf machine (view of, by Messrs Isenthal & Co.), the authors machine - the Trirota system, results obtained from the above machine, view of the author's first condenser influence machine |