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).
Numerical particulars for a Remy 12 cylinder 6 volt ignition coil system.
| Identifier | ExFiles\Box 52\3\ Scan362 | |
| Date | 14th February 1924 | |
| X. 2814 NUMERICAL PARTICULARS. OF IGNITION COIL SYSTEM. SYSTEM. Remy 12 cylinder 6 volt CORE. Length (inches) before turning over. 5.500 Diameter of wire (inches) .036 No. of wires. 235 Total cross section of iron (inches2) .237 Saturation pope strength. (at 10800 poles per sq. in.) 2560 Saturation core flux. 32200 PRIMARY. Number of turns. n 180 No. of layers. 2 Dia. of wire (inches) .040 Approx. resistance (ohms) (working condition). R1 .235 Approx. inductance (secohms) (henries). L .00300 PRIMARY & CORE. Interlinkages per ampere. 10^8 L 300,000 Flux per ampere. 10^8 L/n. 1667 Fraction of saturation per ampere. .052 No. of turns x C.S. area. 42.7 Initial rate of rise of primary current (amperes per second). E {Mr Elliott - Chief Engineer} /L. 2000 14.2.24. | ||