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 the effect of changing the control brush position on the balancing speed of a Lucas E.575 dynamo.
| Identifier | ExFiles\Box 48\3\ Scan135 | |
| Date | 7th December 1920 | |
| X.4211 EFC {E. Fowler Clarke - Electrical Engineer} /T7.12.20. X.30146 EFFECT OF CHANGING POSITION OF CONTROL BRUSH ON BALANCING SPEED OF LUCAS E.575 DYNAMO. X.4211 Original position of control brush - makers' setting. (Makers setting is .3" advance from fully retarded position). Balancing speed 590 at 12.4 volts. Effect of fully retarding is to reduce the cutting in speed very slightly, if anything, i.e. to 585 R.P.M. Effect of advancing brush by .1 from makers setting - no change. Effect of .2 advance - no change. " " .3 " - speed slightly increased, i.e. to 605 R.P.M. " " .4 " - speed 615 R.P.M. " " .5 " - speed 632 R.P.M. EFC. {E. Fowler Clarke - Electrical Engineer} | ||