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).
Letter from The Morgan Crucible Company Limited regarding starter motor brushes and friction coefficients.
| Identifier | ExFiles\Box 61b\3\ scan0095 | |
| Date | 1st January 1929 | |
| X6050 eo 2886. CODES, ABC 4TH, 5TH & 6TH (5 LETTER) EDITIONS. A.I. LIEBER'S & WESTERN UNION (UNIV. & 5 LETTER EDIT.) & BENTLEYS. Inland Telegraphic Address. "CRUCIBLE, PHONE, LONDON" (2 words only chargeable) Cable Address. "CRUCIBLE, LONDON" Telephone N° 2250 BATTERSEA THE MORGAN CRUCIBLE COMPANY LIMITED BATTERSEA WORKS, CHURCH ROAD, LONDON. S.W. 11. MORGANITE TRADE MARK IN REPLY PLEASE REFER TO Z DEPT zh/WH 1st January, 1929. Messrs. Rolls-Royce, Ltd., DERBY. Dear Sirs, Starter Motor Brushes Style D71279. With reference to your letter of the 27th inst. EFC4/T, our metallic brush with the lowest coefficent of friction is Link CM5H which has a higher graphitic content than Link CM3. We note it is your wish to avoid reducing the tension of the pressure springs. In the event of the mechanical resistance proving too high even with Link CM5H we think you should give the question of a reduction of pressure every consideration as the reduction in total friction will be greater than the reduction in the pressure since with these grades the coefficient of friction increases with pressure. Yours faithfully, THE MORGAN CRUCIBLE COMPANY LIMITED per:- [Signature] OW | ||