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).
Specification for electrical testing, detailing voltage and current limits for a primary coil and a consecutive spark test.
| Identifier | ExFiles\Box 49\5\ Scan037 | |
| Date | 21th September 1923 guessed | |
| -3- Contd. (6) A 4-volt battery shall now be applied to the primary and ballast only, in series. The current indicated and the voltages across the primary coil should comply with the following limits :- Current 1.50 to 1.60 amperes. Primary volts 1.40 to 1.55. + There shall be considered to be no missing whem, at some time within a period not greater than one minute, 500 consecutive sparks take place. DIVISION 1804 MADE AT CROXLEY EFC. {E. Fowler Clarke - Electrical Engineer} | ||