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).
Calculated current figures for a coil at 500 R.P.M.
| Identifier | ExFiles\Box 37\1\ scan 067 | |
| Date | 20th January 1920 | |
| Contd. -2- Ck{Mr Clark}3/T20.1.20. Our calculated figures for the coil at 500 R.P.M. of the contact breaker show that the final current to which the rise of current attains is 2.9 amps, that the current at break at this speed is 2.65 amps.. whereas practically the short circuit current is only about 2.0 amps, hence, running dead slow, the current at break is smaller than the current at break at 500 R.P.M. Ck.{Mr Clark} | ||