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).
Specification sheet detailing motor brush dimensions for various vehicle models.
| Identifier | ExFiles\Box 61b\3\ scan0181 | |
| Date | 5th January 1927 | |
| X6050 5.1.27. MOTOR BRUSH DIMENSIONS. 40/50 HP. 6" .375 1.000 .375 sq." Two on opposite sides of commutator. 20 HP. .300 .500 .150 sq." Two on opposite sides of commutator. Phantom. .340 .435 .148 sq." .435 .148 sq." Two pairs on opposite sides of commutator. EFC. | ||