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 log for R.R. EAC Dynamos, detailing output and brush settings.
| Identifier | ExFiles\Box 70\4\ scan0058 | |
| Date | 8th April 1925 | |
| X.8781 do. X.8660. R.R. EAC. DYNAMO. X.8781 do. Date. | Dynamo number. | (1) Remarks. | (2)(3)(4) Remarks. | (5) Output at 1050 rpm. Amperes (9.5 to 10.5) Volts (14.6 to 14.8). | (6) O.C. Volts at 550 rpm. (> 13.6). | (7) (8) (9) (10) Remarks. | Brush setting angles. ---|---|---|---|---|---|---|--- 8.4.25. | D.{John DeLooze - Company Secretary} | Springs heavy. M.15-17 ozs. C.14-15 ozs. 1 brushes tend to foul spigot when being withdrawn. | O.K. | 10.5 | 14.80 | 15.43 | O.K. | 120° 122° 22.4.25. | GU.55. | Machine from prodn. Control springs heavy; 14 - 16 ozs. | O.K. | 10.35 | 14.75 | 14.45 | O.O. | 120 122° 29.4.25. | E.{Mr Elliott - Chief Engineer} | | O.K. | 9.45 | 14.60 | 15.35 | Failed on insul'n test, so not completed. | 120° 122.5° 2 5.25. | D.{John DeLooze - Company Secretary} | | | 11.85 | 14.80 | 15.70 | - | 120° 120° std 4.5.25. | E.{Mr Elliott - Chief Engineer} | Large air- gap. | | 10.40 | 14.80 | 13.03 | | 120° 120° 6.5.25. | 03 | Large air gap. | | 9.50 | 14.60 | 13.80 | | 120° 120° 15.5.25. | E | | | 11.48 | 14.75 | 15.70 at 540 15.3 | | 120° 120° Std 21.8.25. | EB.35. | Machine from prodn. Corner chipped off C.C. brush | O.K. | 11.75 | 15.0 | O.C. volts low 13.6 V at 550 r.p.m. | O.K. | 120° 120° 21.10.25 | ON 55 | C.C. brush had not .002 clearance but quite free in holder. C. brush springs on strong side, i.e. 13 ozs. | O.K. | 10.95 11.75 | 15.0 | Volts at 540 r.p.m. 14.15 | O.K. | 120° 120° | ||