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).
From the Research Department showing tabulated electrical test results.
| Identifier | ExFiles\Box 137\2\ scan0020 | |
| Date | 7th February 1938 | |
| 12-7 EWS/JF MEMORANDUM 7th February, 1938. Report dated. 5. 2.38. From RESEARCH DEPT. To - 2 - | Volts across circuit | Resistance of Rheostat OHMS | Volts across Motor. | Volts across Rheostat | Current in circuit. | Motor Watts. | Rheostat Watts. | R.P.M. | Remarks. | Stud No. | |---|---|---|---|---|---|---|---|---|---| | 12 | 3.46 | 8.075 | 3.96 | 1.145 | 9.2 | 4.54 | 1600 | | 4 | | 12 | 2.08 | 9.5 | 2.5 | 1.2 | 11.4 | 3.0 | 2170 | | 5 | After running for 3 hours. | 12 | 7.85 | 5.05 | 6.95 | .885 | | | 910 860 | speed falling | 1 | | 12 | 6.22 | 5.5 | 6.5 | 1.045 | | | 520 | progress- ively | 2 | | 12 | 5.0 | 6.45 | 5.55 | 1.11 | | | 1260 | and failed to start on 1st. stud | 3 | | 12 | 3.55 | 7.95 | 4.05 | 1.14 | | | 1860 | after revs. | 4 | | 12 | 2.09 | 9.6 | 2.4 | 1.15 | | | 2430 | had fallen to 150 per minute | 5 | | ||