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).
Instruction sheet detailing test results for a Lucas ES75 Dynamo at various control brush settings.
| Identifier | ExFiles\Box 36\4\ scan 077 | |
| Date | 9th June 1920 | |
| R.R. 500 (120B) (SF 349 24-1-19) MP 200552 X.30146 91617 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: S.F.C. Order No. X.30146 Customer's No. FB 84 Re. X.30146 Lucas ES75 Dynamo. Constant speed with variation of Control brush position (Hot 83°C.) Table of results: Control brush position | Amperes | Volts Full retard | 8.15 | 14.60 "B" Advance | 8.35 | 15.00 .2 Advance | 8.60 | 15.00 .3 Advance* | 9.20 | 15.10 .4 " | 9.80 | 15.2 .5 " | 10.0 | 15.2 .6 " | 10.55 | 15.25 .7 " | 11.25 | 15.30 .8 " | 11.40 | 15.35 .85 " | 11.50 | 15.35 * Makers Setting Speed Constant at 1450 Signed This Sheet must be filed on completion of the work. | ||