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).
Confirming the correct control brush angle for N.B. type dynamos from 122° to 121°.
| Identifier | ExFiles\Box 70\4\ scan0084 | |
| Date | 10th January 1928 | |
| To EY/RD. from EFC. c. Mr. Brock. X8781do EFC1/T10.1.28. N.B. DYNAMOS. X.8781do. X.8671. Having further carefully examined the question of the control brush angle for the N.B. type of machine, we have confirmed our previous decision that 121° is the right angle (in place of 122° as heretofore). We should be pleased if you would please have production instructions altered accordingly. We are returning to Mr. Brock the seven machines that we have not yet tested, for this alteration, and we should like them again returned to us for production test previous to handing over for production. EFC. | ||