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).
Extract from the production specification for inspection and testing of Watford E06 (d) magnetos for EAC.
| Identifier | ExFiles\Box 48\2\ Scan232 | |
| Date | 2nd February 1925 guessed | |
| X8796 EFC {E. Fowler Clarke - Electrical Engineer} /T6.2.25. X.8781m. WATFORD E06 (d) MAGNETOS FOR EAC. Extract from Production Specification of Inspection & Test. Maximum primary gaps .011 ±1 Safety spark gap 8.2 to 8.5 mm. Available range - not less than 58° Limits of tangential load to operate contact breaker lever - 3 to 5 lbs. Slowest speeds for regular sparking on 5.5 mm. gaps in air:- (a) Fully advanced position 280 r.p.m. (b) Central. " 270 r.p.m. (c) Fully retard " 190 r.p.m. EFC. {E. Fowler Clarke - Electrical Engineer} | ||