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 listing the status and allocation of 'R' Aero Engine Magnetos.
| Identifier | ExFiles\Box 43\4\ Scan186 | |
| Date | 25th September 1929 | |
| X4021. 25.9.29. X.4513B. X.4021. R.R. "R" AERO ENGINE MAGNETOS. B.T.H. TYPE SC.12/9 R.H. L.H. Remarks Engine allotted to. {B.5216 B.5204 Loose poles R.3 {B.5218 B.5202 O.K. O.K. Spares {B.5220 B.5208 R.7 {B.5222 B.5212 O.K. Loose poles R.5 {B.5224 B.5206 O.K. O.K. R.11 {B.6752 B.7202 R.15 {B.10028 B.10030 O.K. O.K. R.17 {B.10032 B.10034 O.K. O.K. R.9 WATFORD SP.{Mr Spinney}12/5. {98087 98089 O.K. O.K. R.1 {98088 98090 O.K. O.K. Spares | ||