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).
Specifications for a 24 Volt motor from Asteroidal Coventry.
| Identifier | ExFiles\Box 163\3\ img031 | |
| Date | 9th April 1936 | |
| 9.4.36. GRAHAM. ASTEROIDAL COVENTRY. MOTOR TO BE 24 VOLT CA. 3750 NOT CA. 4125 WEST. | ||