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).
Specification sheet detailing the numerical particulars of an ignition coil system.
| Identifier | ExFiles\Box 69\1\ scan0001 | |
| Date | 24th February 1924 | |
| X8710 NUMERICAL PARTICULARS. OF IGNITION COIL SYSTEM. SYSTEM. Final Standard tall coil for RR. Battery Ignition (Stabalite base). 8.00 volts CORE. Length (inches) before turning over. 4.150" Diameter of wire (inches) .022" No. of wires. 740 approx Total cross section of iron (inches2) .282" Saturation pope strength. 3045. (at 10800 poles per sq. in.) Saturation core flux. 38250 PRIMARY. Number of turns. n 300±10 No. of layers. 4 Dia. of wire (inches) .028. Approx. resistance (ohms) (working condition). R1 1.18 Approx. inductance (secohms) (henries). L .0096 PRIMARY & CORE. Interlinkages per ampere. 10^8 L 960,000 Flux per ampere. 10^8 L/n. 3200 Fraction of saturation per ampere. .084 No. of turns x C.S. area. 85.0 14.2.24. Initial rate of rise of primary current (amperes per second). E/L 8335 24.2.24. | ||