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).
High and low speed sparking characteristics and contact breaker performance.
| Identifier | ExFiles\Box 48\2\ Scan071 | |
| Date | 13th July 1923 guessed | |
| -5- Contd. (15) High speed sparking characteristics :- 1 Max regular sparking gap for all high speeds:- (a) 6.5 mm (b) 8.5 mm (c) 9.5 mm 2 Shortcircuiting one gap extinguishes spark immediately following for:- (a) at 2,700 r.p.m. (b) at 3,300 r.p.m. (c) Sparks not affected at retard at all. Sparks otherwise appear quite equal. (16) Low speed sparking characteristics :- Speeds :- (a) 220 r.p.m. (b) 330 r.p.m. (c) 410 r.p.m. (17) Flinging of contact breaker at high speed :- Contd. | ||