Table of dynamo output readings in amps at various speeds (M.P.H.) for warm and hot conditions with head, side and tail lamps on.
| Identifier | ExFiles\Box 11\3\ 03-page432 | |
| Date | 12th July 1931 | |
| 25-EX. DYNAMO OUTPUT. WITH HEAD, SIDE AND TAIL LAMPS. | WARM | | HOT | | | M.P.H. | AMPS. | M.P.H. | AMPS. | | 10 | - 10.50 | 10 | - 10.50 | | 17 | Balanced | 20 | - .50 | | 20 | + 1.00 | 22 | Balanced | | 30 | + 1.50 | 30 | Balanced | | 40 | + 1.00 | 40 | - .25 | | 45 | Balanced | 45 | - .5 | | 50 | - .50 | 50 | - 1.00 | | 60 | - 1.00 | 60 | - 2.00 | | 70 | - 2.00 | 70 | - 3.00 | | 80 | - 2.00 | 80 | - 4.00 | J.H.H. | ||
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).