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 45\4\ Scan002 | |
| Date | 25th October 1921 | |
| X. 4079 25.10.21. X.3445. X.4079 TEST RESULTS OF STD & U.S.A. BOSCH IGNITION COILS. X.4275. PRIMARY SECONDARY Coil. Resis. Imped. at Reac. at Induc. Resis. Imp. at Reac. at Induc. Remarks. (W) 50 (W). 50 (W) (hys) (W) 50 (W). 50 (W) (hys) 4C/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 2 TT 3075 .66 2.16 2.06 .00655 2150 8350 8080 25.7 p -50.0 x 2 TT 3076 .66 2.19 1.99 .00632 2200 8760 8490 27.0 " " " 3077 .64 1.97 1.86 .00591 2200 8590 8300 26.4 " " " R.R. B. Old. .492 3.213 3.175 .0101 8130 18430 16550 52.7 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 GB 3 .627 3.03 2.962 .00944 3975 9720 8380 26.65 GB 4 .630 3.04 2.972 .00946 4238 9810 8850 28.15 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 Handwritten note next to GB coils: Recd. Feb. 1922. Low Secondary Turns. | ||