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).
Test report on Le-Carbone EG3417 narrow brushes on an M Machine, including brush wear results.
| Identifier | ExFiles\Box 60\1\ Scan031 | |
| Date | 24th October 1927 | |
| RR 239 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.F.C. Order No.: P.D.8. Customer's No.: X 8673 Date: Oct. 24th 1927 Test of Le-Carbone EG3417 Narrow Brushes on M Machine One set of narrow brushes, in grade EG3417 material, were submitted for test by the Le-Carbone company 27-1-27. These brushes represent the type containing the largest quantity of lubricant, without actually being impregnated. The decision to obtain these brushes, was the outcome of the results obtained some time ago with some of the LFC3ABS grade, which is a soft graphitic type of brush, not very strong mechanically, but which gave excellent results from commutation and silence point of view. This set of EG3417 brushes was tested under similar conditions to those of previous brush tests, the results being as follows:- Brush wear. | | Positive | Negative | Control. | |---|---|---|---| | Inner | .0145" | .009" | .014" | | Outer | .0105" | .0065" | .0105" | Cont'd.{John DeLooze - Company Secretary} Signed This Sheet must be filed on completion of the work. | ||