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).
Table detailing the primary and secondary resistance values for various induction coils.
| Identifier | ExFiles\Box 52\3\ Scan321 | |
| Date | 3rd April 1918 | |
| X.2814 3.4.18. X.562. X.918. RESISTANCES OF PRIMARIES AND SECONDARIES OF INDUCTION COILS (True ohms) (cold). X.2814. Coil. Voltage. Primary resis. Secondary resis. 8384 Trembler. 4 .425 4660 6409 " 4 .380 4465 6161 " 6 .965 6055 6162 " 6 1.000 5970 6163 " 6 1.030 ? 6365 No.1 " 6 .880 6325 No.O " 12 3.50 6595 Remy 12 Cyl. 6 .805 (with ballast) 4360 Remy 6 cyl. 6 {1.080 (with ballast) 2900 { .850 (without ") R.R. 6 cyl. 12 1.736 (no ballast) 5400 | ||