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).
Calculations for the rise of current in the primary circuit of a standard tall coil for battery ignition.
| Identifier | ExFiles\Box 69\1\ scan0006 | |
| Date | 30th April 1924 | |
| X8710 30.4.24. R.R. BATTERY IGNITION. STANDARD TALL COIL FIGURES. A.{Mr Adams} RISE OF CURRENT IN PRIMARY CIRCUIT. E = 8.00 volts R = 2.53 ohms. L = .0096 henry. Then final current Co = E/R = 3.16 amperes and time constant t, = L/R = .003795 seconds = time to rise to .632 x 3.16 = 1.99 amperes. Initial rate of rise of current (di/dt)o = E/L = 833 amperes per second i = 3.16 (1 - e^-263.5 t) Contd. | ||