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).
Test results for a Dynamo OA (Amended), showing cell voltages and peak outputs when run on various batteries with chassis wires.
| Identifier | ExFiles\Box 54\2\ Scan081 | |
| Date | 5th December 1925 | |
| E.T.C. X4617 X.8660. DYNAMO OA (Amended) (Run on various batteries with chassis wires) Table Headers: Row 1: Battery. | Cell voltages. | Total volts. | Peak output hot. | Peak cold. Row 2: | - 1 | 2 | 3 | 4 | 5 | 6 + | On charge. | Max. Off charge. | Dyn. Volts. | Amps. | Speed. | Temp. | Amps. | Volts. Table Data: Row 1: S4 | 2.67 | 2.92 | 2.60 | 2.91 | 2.64 | 2.91 | 16.65 | 15.0 | 17.86 | 11.20 | 1250 | 20-42-62 | | Row 2: Std. P & R. {Sir Henry Royce} | 2.86 | 2.84 | 2.83 | 2.86 | 2.85 | 2.85 | 17.09 | 15.6 | 18.36 | 11.80 | 1200 | 17-45-62 | 16.0 | 18.8 Row 3: S1 | 2.70 | 2.91 | 2.67 | 2.90 | 2.68 | 2.90 | 16.76 | 15.2 | 17.90 | 11.30 | 1200 | 17-41-58 | | Row 4: SPL. | 2.34 | 2.30 | 2.30 | 2.31 | 2.31 | 2.30 | 13.86 | 13.35 | 14.90 | 9.30 | 1225 | 19-32-51 | | Row 5: Std. Exide. | 2.70 | 2.69 | 2.66 | 2.69 | 2.67 | 2.67 | 16.08 | 14.5 | 17.20 | 11.10 | 1190 | 16-40-56 | 15.7 | 18.5 Row 6: Std. P & R. {Sir Henry Royce} (latest) | 2.77 | 2.77 | 2.76 | 2.76 | 2.73 | 2.79 | 16.58 | 15.16 | 17.66 | 11.0 | 1150 | 16-40-56 | 14.8 | 18.36 | ||