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).
Test results for a closed-circuit primary ampere-speed curve and various sparking characteristics.
| Identifier | ExFiles\Box 43\4\ Scan246 | |
| Date | 18th February 1930 guessed | |
| -4- (10) Closed circuit primary ampere-speed curve :- Speed. Amperes. Speed. Amperes. 100 1.06 2400 1.53 200 1.23 2800 1.54 300 1.28 3200 1.53 400 1.32 3600 1.52 600 1.36 800 1.41 1200 1.48 1600 1.51 2000 1.53 (11) Utility test speeds :- Will not spark over gap at any speeds. [Gap connected by 6' long braided cable] (12) Maximum high speed sparking :- OK at 5200 r.p.m (13) Contact breaker gap after previous tests :- .014" Maximum speed :- OK at 5200 r.p.m. (14) Low speed sparking characteristics. Speed :- (a) 195 (b) 270 (c) 700 contd. | ||