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 Morganite E.G.O dynamo brushes following bench and road testing.
| Identifier | ExFiles\Box 60\1\ Scan294 | |
| Date | 16th December 1930 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 431-8.12.24) MP 306975 X. 8673 ROLLS-ROYCE LTD. INSTRUCTIONS. To E F C Order No. PD57 Customer's No. Dec. 16th 1930 x.8673. Test of Morganite E.G.O Brushes. These brushes represent the softest grade of the electro-graphitic class. A set was first run on the bench, and compared for silence with the standard ^EG.2 grade. In this respect they were found to be a little better than the standard brushes. They were subsequently fitted to a medium output dynamo, SS{S. Smith}2, which travelled 10,467 miles on 20EX. The machine was then removed from the car for bench examination and test, the results of which were as follows:- Insulation tested; quite alright. The appearance of the commutator surface was normal, the amount of blackening being about the same as with standard brushes; varying from zero up to about one third of a Cont'd.{John DeLooze - Company Secretary} Signed This Sheet must be filed on completion of the work. | ||