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).
Graph of dynamo output in amps versus speed in MPH for a 12 coil armature modification, with and without lights on.
| Identifier | ExFiles\Box 5a\2\ 02-page186 | |
| Date | 3rd February 1930 | |
| TOP GEAR DYNAMO OUTPUT. DYNAMO No.31138 12 COIL ARMATURE AND TRAILING FIELD POLE MODIFICATION. MILES PER HOUR AMPS With head lights, side, tail and fascia board lights DYNAMO OUTPUT WITH NO LIGHTS ON 20/25 HP 5.25 compN 9/41 HYPOID. 2F-3-30 2414 | ||