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 49\5\ Scan222 | |
| Date | 10th December 1920 | |
| R.R. 235A (100 T). S.H. 798. 10-12-20. G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 -5- Contd. (15) High speed sparking characteristics :- Max gap for (a) 7.2 m m. {Mr Moon / Mr Moore} all high (b) 7.4 m m. {Mr Moon / Mr Moore} } Missing occurs on longer gaps. speeds. (c) 7.4 m m. {Mr Moon / Mr Moore} Shorting each (a) Spark following shorted gap extinguished. gap in turn (b) Alternate sparks extinguished, but others not while varying (c) Sparks only slightly so decidedly affected. the speed. (a) } Sparks appear equal, but a little irregular (b) } at high speeds, due to flashing at the breaker (c) } as though lever was flinging. (16) Low speed sparking characteristics :- Speeds :- (a) 102. r.p.m. (b) 124. r.p.m. (c) 180. r.p.m. (17) Flinging of contact breaker at high speed :- Contd. | ||