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).
Instructions detailing the results of sparking tests with different gap settings.
| Identifier | ExFiles\Box 50\2\ Scan007 | |
| Date | 24th January 1919 | |
| RR. 300 (120B) (SF 349 24-1-19) MP 200552 88251 ROLLS-ROYCE LIMITED. INSTRUCTIONS. 19 To Order No. Customer's No. 2 Re "Radaman" (Contd) With gap of .003" sparking ceases at sight-hole at all the above speeds. A spark at the main gaps is always louder & more intense than normally with the tester in position (capacity effect) Single gap used for most of the above tests. Signed F Allen. This Sheet must be filed on completion of the work. | ||