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).
Table of performance data showing revolutions, amperage, voltage, horsepower, and efficiency.
| Identifier | ExFiles\Box 61b\3\ scan0023 | |
| Date | 9th November 1914 | |
| -2- Revs. Amps. Volts. Electrical HP. Brake HP. Efficiency. 510. 115. 9.6 1.47 .45 43% 380. 125. 9.1 1.5 .38 36% ---oOo--- R.R. 235a. 150 (H) (W.W. 927. 9-11-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0821. | ||