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).
Test results of standard and U.S.A. Bosch ignition coils.
| Identifier | ExFiles\Box 61b\4\ scan0082 | |
| Date | 15th September 1922 | |
| X.4275. 15.9.22. X.3445. X.4079. X.4275. TEST RESULTS OF STD. & U.S.A. BOSCH IGNITION COILS Coil. PRIMARY SECONDARY Resis. (W). Imped.at 50~(W). Reac.at 50~(W). Induc. (hys). Resis. (W). Imp.at 50~(W). Reac.at 50~(W). Induc. (hys). Remarks. 40/50.Z. 2197. .866 4.30 4.22 .0134 5362 12000 10730 34.2 2209. .896 4.42 4.33 .01378 5210 12100 10910 34.7 149 .857 4.65 4.565 .01432 5540 14750 13680 43.5 U.S.A. B. Original. .75 2.18 2.045 .00643 4350 14580 13900 44.2 p -50.7 x 2π 3075 .66 2.16 2.06 .00655 2150 18350 8080 25.7 p -50.0 x 2π 3076 .66 2.19 1.99 .00632 2200 8760 8490 27.0 " 3077 .64 1.97 1.186 .00591 2200 8590 8300 26.4 " R.R. B1. .492 3.213 3.175 .0101 8130 18430 16550 52.7 Experimentally B2. .482 3.11 3.08 .0098 9300 19800 17480 55.6 constructed B coils GB 1 .631 3.131 3.065 .00976 4320 10310 9350 29.75 GB 2 .637 3.04 2.975 .00946 3890 8950 8030 25.5 Recd. Feb.1922 GB 3 .627 3.03 2.962 .00944 3975 9720 8380 26.65 Low secondary GB 4 .630 3.04 2.972 .00946 4238 9810 8850 28.15 turns. GB 5 .633 3.15 3.085 .00982 3908 8850 7930 25.25 SB{Mr Bull/Mr Bannister} 1 .610 2.89 2.822 .00898 7720 18510 16820 53.5 GB 6 .633 2.89 2.82 .00897 8500 18900 15850 50.5 GB 11 .640 3.05 2.98 .00948 8300 19800 17980 57.2 | ||