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\ scan0070 | |
Date | 25th October 1921 | |
X.4275. 25.10.21. X.3445. X.4079 TEST RESULTS OF STD & U.S.A. BOSCH IGNITION COILS. X.4275. | Coil. | PRIMARY. | | | | SECONDARY. | | | | Remarks. | |---|---:|---:|---:|---:|---:|---:|---:|---:|---| | | Resis. (W) | Imped. at 50 (W) | Reac. at 50 (W) | Induc. (hys) | Resis. (W) | Imp. at 50 (W) | Reac. at 50 (W) | Induc. (hys) | | | 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 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. | | | | | | | | | | | 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 | } Recd. Feb 1922. | | GB 2 | .637 | 3.04 | 2.975 | .00946 | 3890 | 8950 | 8030 | 25.5 | } Low Secondary Turns | | GB 3 | .627 | 3.03 | 2.962 | .00944 | 3975 | 9720 | 8380 | 26.65 | } | | GB 4 | .630 | 3.04 | 2.972 | .00946 | 4238 | 9810 | 8850 | 29.15 | } | | GB 5 | .633 | 3.15 | 3.085 | .00982 | 3908 | 8858 | 7930 | 25.25 | } | | SB{Mr Bull/Mr Bannister} 1 | .610 | 2.89 | 2.822 | .00898 | 7720 | 18510 | 16820 | 53.5 | | | ||