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 Synthetic Carbon & Engineering Company regarding the performance, materials, and pricing of carbon brushes and seals.
| Identifier | ExFiles\Box 166\1\ img067 | |
| Date | 18th May 1938 | |
| Kensal/Kollo-2/LJK DERBY 18th May, 1938 We have found from practical experience that with four brushes over the two surfaces the stability of the brushes is much more than double the value, as demonstrated by re-test. We should be glad to submit for your examination a further set of four which we suggest could be fitted to the starter motor, and which are the same material as before except that they are 3/8" x 7/16", and are joined together with the stud fixing. We are perhaps a little over-anxious in this matter, but we feel that if we can offer a perfectly reliable set we shall be justified in so doing. The brushes are 3/8" x 1/2" as fitted, and are split-tested. The samples have phosphor-bronze springs and are also supplied with stainless steel springs. There is no difference in price for either of these, but we have found that the springs supplied right up to left-hand sources, whether supplied right or left-hand, continued. Both types are available at scale prices, not reduced. - and other seals are offered as demanded. Seals Below we may mention that the pricing would be:- Sizes: 1/2" x 3/8" 3/8" x 3/8" 1/4" x 3/8" 3/8" x 1/2" 1" x 3/8" Pricing: For lots of 100......9d each For lots of 500......8d each For lots of 1,000.....7d each For lots of 5,000.....6d each For lots of 10,000....5d each and shortages at regular quantities. Thanking you again for the consideration kindly accorded, and assuring you of our utmost care and attention, we are, dear Sirs, Yours faithfully, p.p. SYNTHETIC CARBON & ENGINEERING COMPANY, LTD. East Acton Lane, W.3. | ||