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).
Test report comparing induced spark lengths from magneto wires versus battery wire terminals.
| Identifier | ExFiles\Box 52\1\ Scan046 | |
| Date | 20th June 1920 | |
| RM {William Robotham - Chief Engineer} 239 (150 BKS.) 18H57. 20-6-20. [MP 224388] ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. (2) Customer's No. 19 induced sparks at the terminals of the magneto wires were as follows:- No. Spark length 1 .030" 2 .025" 3 .025" 4 .025" 5 .020" 6 .015" and with the magneto sparking the sparks obtained at the battery wire terminals were:- NO. Spark lengths 1 .015" 2 .025" 3 .035" 4 .035" 5 .035" 6 .045" These results are appreciably the same as those obtained with the Signed contd This Sheet must be filed on completion of the work. | ||