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).
Instructions for an investigation into a new grade of brush, spring pressure, and commutator surfaces to reduce noise.
| Identifier | ExFiles\Box 60\1\ Scan241 | |
| Date | 2nd June 1930 guessed | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To__________________________________________________________19__ Order No. P.D. 53 (6) Customer's No.___________________ indicate that further investigation should be in the direction of a new grade of brush, possibly one of the graphitic class, and an increased bevel of about 30°, together with the special type of spring and a suitable spring pressure. In the meanwhile Production will look to the surfaces of the commutators, and the insides of the brushholders as means of quietening the brushes. Signed C.A.P. .This Sheet must be filed on completion of the work. | ||