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 on various ignition coil and contact breaker configurations for component 7.C.A.
| Identifier | ExFiles\Box 52\3\ Scan339 | |
| Date | 14th February 1916 guessed | |
| X2814 Tests on 7.C.A. No | Condition | Amps. | Length of H.T. Spark when engine is retarded 6 cyls. | Length of Spark at 500 rpm | Sparking at Contact Breaker 2000 reps 3000 reps | Length of wire to Contact Breaker 1 | Remy Coil contact breaker & coil. | 4.9 St 3.1 | 5/16" | 9/16" | very Bad 1-2 amps | Slightly 3.0 amps | 12 inches. 2 | Remy Coil R.R. Contact Breaker | 4.9 St 1.3 | 5/16" | 15/32" | Slight .4 amps | Slightly 1.3 amps | 12 inches. 3 | R.R. Coil trembler cut-out Remy Contact Breaker | 9.4 Our 10 St | 3/4 | 9/16" | very Bad 5.2 amps | very Bad | 5 ft. 4 | R.R. Coil trembler cut out. R.R. Contact breaker | 2.7 | 1/2 | 3/4" | very slight .7amps | very Bad 2.3 ARS | 5 ft. 5 | Remy Outfit with long wire to contact Breaker | 3.1 | 11/32 | 13/32 | Bad 1.3 ARS | Bad 2.9 | 5 ft. 6 | R.R. Outfit with short wire to contact breaker | 4 | 1/2 | 1/2 | very slight 1.2 | very Bad 3.5 ARS | 12 inches. 7 | Remy with R.R. Contact breaker & long wire. | 1.3 | 3/8 | 15/32 | Slight .5 ARS | moderate 1.4 ARS | 5 ft. 8 | Special Coil 6 Volts Contact R.R. | 1.3 | 3/8" | 1/2" | very slight .5 ARS | moderate 1-3 | 12 inches. 9 | Special Coil 6 Volts. contact | 3.1 5.6 St | 3/8 | 1/2 | Bad 1.4 ARS | bad 3 ARS | 12 inches. | ||