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).
Brush wear and performance, concluding that a new type is less reliable and not recommended.
| Identifier | ExFiles\Box 60\1\ Scan135 | |
| Date | 1st December 1924 | |
| RR 238 (150 BKS.) (D3 451-B 12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To__________________________19___ Order No. PD 41 (4) Customer's No.____________ Brush-dust deposit was not excessive but brush-wear was very heavy. Brush wear was as follows:- Position | Positive | Negative | Control Inner. | .026" | .026" | .020" Outer. | .019" | .023" | .024" Generally it appears that these bushes are more liable to stick under ordinary running conditions than the present standard type; any tendency to stick being aggravated by the increased bevel. The bushes are, therefore, less reliable than the standard. Furthermore, there appears to be no permanent reduction in brush noise with the use of them, while on the other hand the wear is increased. Consequently this type of brush in its present form cannot be recommended. Signed C A P This Sheet must be filed on completion of the work. | ||