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 adjustments to a contact breaker and ballast, and observing performance at various RPMs.
| Identifier | ExFiles\Box 69\1\ scan0147 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (OB 461-8.12.24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To ___________ 19__ Order No. (3) Customer's No. __________ then increased to .025" and it was found possible to insert an external gap of .100" without irregular sparking at 700 rpm. At 200 rpm with no external gap there was occasional missing only. Readjusting the contact breaker gap to .018" we removed the double ballast and substituted a single one and again observed the performance. At 700 rpm it was found possible to insert as much as .360" external gap without irregular sparking; and at 200 rpm .140" external gap was possible without irregularities. Signed (contd) This Sheet must be filed on completion of the work. | ||