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).
Extract from a report discussing dynamo brushes, comparing Le Carbone, Morganite, and Bijur types.
| Identifier | ExFiles\Box 51\1\ Scan060 | |
| Date | 12th April 1922 | |
| X-4383 Extract from R's report of 12.4.22 on 4.Gos.II. X.4383. Our dynamo has so far worked faultlessly. I am quite prepared to agree to Mr. Clark's suggestion of a thinner 3rd speed brush. I am inclined to think the Le Carbone will supply a better brush for wear than Morganite, also we must be aware of the carbon brush growing as in case of Bijur at Wittering. Le Carbon are reported to be free from this fault, which might cause the owner a lot of trouble and get RR. a bad name. Make certain before departing from my advice. Try another type Le Carbone - it should be a high resistance brush of good stable qualities. | ||