From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Continuation sheet from North & Sons Ltd. discussing safety gap issues on Watford Magnetos.
| Identifier | ExFiles\Box 65\3\ scan0415 | |
| Date | 9th July 1930 | |
| NORTH & SONS Ltd. Continuation Sheet No.1 Messrs. Rolls-Royce Ltd. 9th July, 1930. If a safety gap is set so small that it takes care of steady overload then there will be so much leak in the form of brush discharge and occasional sparking that the engine would not run. All the insulated parts of Watford Magnetos will stand the breakdown potential of the safety gap; the schedule of tests calls specially for a safety gap test at the time of manufacture, but no Magneto will withstand indefinitely its secondary circuit loaded to the potential of the safety gap. Yours faithfully, p.p. NORTH & SONS. LIMITED. C A Thompson. | ||