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).
Design considerations for ignition coils and magneto armatures using tungsten points on the contact breaker.
| Identifier | ExFiles\Box 61b\1\ scan0077 | |
| Date | 1st April 1930 | |
| X2894 April 1930. X.8680. X.480. (crossed out) Considerations in the design of ignition coils and magneto armatures when tungsten points are used on the contact breaker. X.3199. X.1818. X.2894. (a) The primary current at break must not exceed 4.0 amperes. (b) The primary voltage at break should not exceed approx. 280 volts. EFC/HEW. | ||