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).
Correcting the angle for the control brush on a Phantom dynamo with a 28 slot armature.
| Identifier | ExFiles\Box 68\4\ scan0052 | |
| Date | 30th January 1929 | |
| X8672 To BY/RD. from EFC. EFC4/T30.1.29. PHANTOM DYNAMO WITH 28 SLOT ARMATURE We are now able to say that the angle between the control brush and the positive main brush on the Phantom dynamo with the 28 slot armature s hould be 122° in place of the angle of 124° previously given. This new angle is based on results obtained from six machines borrowed from production for that purpose, and is considered to be the best average angle. EFC. | ||