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 data sheet for various ignition coils on a chassis ignition contact breaker.
| Identifier | ExFiles\Box 34\1\ Scan032 | |
| Date | 10th December 1918 | |
| 10.12.18. COILS TO BE TRIED ON R.R. CHASSIS IGNITION CONTACT BREAKER. No. Coil. Resistance. Inductance. Make ratio. Cap. Total Resistance. Ballast Resis. L.M.S. Current. Ballast Volts. 1. No.0 3.50 .042 .475 .022" 4.60 1.10 .76 .835 2. 6162 1.00 .0097 .23 .038" 2.22 1.22 1.09 1.35 3. A1 1.86 .024 .36 .030" 3.48 1.52 .875 1.42 4. B .54 .010 .235 .038" 2.25 1.71 1.07 1.83 (Vertical text on right margin): R.R. 255A (500 D'y) S D 408 26-4-17) B'm.{Mr Moon / Mr Moore} 215613 | ||