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 comparing output curves for standard and lengthened Lucas E57S dynamos under hot and cold conditions.
| Identifier | WestWitteringFiles\G\June1921\ Scan107 | |
| Date | 23th June 1921 guessed | |
| X.4352. LUCAS LENGTHENED E57S DYNAMO. HOT AND COLD CONDITION OUT PUT CURVES. CURVE OF SPECIFIED PERFORMANCE OF FOR. RR CAR. AND AVERAGE PERFORMANCE OF LUCAS E57S MACHINES. AVERAGE OF STANDARD LUCAS E57S DYNAMOS (HOT) LENGTHENED LUCAS E57S (HOT) SPECIFIED PERFORMANCE (HOT) AMPS OUT PUT DYNAMO SPEED (R.P.M.) | ||