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 Liberty dynamo, showing speed versus volts under hot conditions.
| Identifier | ExFiles\Box 37\2\ scan 089 | |
| Date | 8th June 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 91015 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.Y.C. 8/6/20 Order No: X. 3306. Customer's No.: 713 82. Re: Liberty dynamo C.C. Volts Hot condition 76°C Plain Shunt Speed | Volts 735 | 6.0 790 | 7.0 840 | 8.0 890 | 9.0 930 | 10.0 980 | 11.0 1040 | 12.0 Signed This Sheet must be filed on completion of the work. | ||