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).
Typed page analysing a pseudo-arc and retarded spark with references to sketches.
| Identifier | ExFiles\Box 63\4\ scan0024 | |
| Date | 26th May 1918 guessed | |
| -24- appears superposed upon this pseudo-arc (see sketch 99) and the 5mm retarded spark shows traces of this also (sketch 103). EFC. | ||