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).
Repeat tests of EGO and EG2 Morganite brushes on a Goshawk Dynamo.
| Identifier | ExFiles\Box 172\2\ img023 | |
| Date | 7th December 1923 | |
| EFC. COPY. AB.96. 7th. Dec. 1923. X.4333 - REPEAT TESTS OF EGO AND EG2 MORGANITE BRUSHES ON GOSHAWK DYNAMO. A set of each of the above has been run again on the direct coupled rig, for the usual equivalent of 2500 miles continuous running and 45 hours intermittent running. EGO. Sparking with these was slightly more than the normal with Z. brushes; the commutator was left a medium brown, but rather irregular. The brushes themselves acquired a good surface, though they were somewhat noisy on the commutator. The amount of wear is - Positive .023" - Negative .017" - Control .021". EG2. Sparking about the same, commutator slightly better, but not so uniform as with the Z brushes. The brushes were less harsh on the commutator and their surfaces very slightly better than the EGO grade. The wear is - Positive .018" - Negative .016" - Control .0135". According to this test in which the brush tops were bevelled and the commutator was machine-slotted, the EG2 brushes are the better grade. EFC/FJA | ||