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 the dimensions and installation of four brushes.
| Identifier | ExFiles\Box 37\2\ scan 093 | |
| Date | 19th July 1917 | |
| R.R. 199 (250T) (SD676 19-7-17) MP 180865 -3- Contd. There are four brushes, each being .35" x .225" or .078 sql ins. per brush holder. All brushes are soldered into the holders, and the two negatives earthed. (Sgd) C.A.P. | ||