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).
Page of calculations for quantity, energy, current, and magnetic field efficiency.
| Identifier | ExFiles\Box 69\1\ scan0008 | |
| Date | 30th April 1924 guessed | |
| -3- Contd. The quantity per period = CT' = .01245 coulomb Energy per period given by battery = ECT' = .0995 Joule The mean squared current I = C₀ √r - 2 x s + 1/2 s y = 3.16 √.500 - .450 + .1295 = 3.16 x √.1795 = 1.34 amperes I/C = 1.34/.870 = 1.54 The available energy of magnetic field per spark = W' = 1/2 LCI² = .0048 x (2.68)² = .0345 Joule The efficiency of magnetic field production = .0345/.0995 = .347 ___________ | ||