Fault with a Goshawk Dynamo Armature caused by copper cuttings.
| Identifier | ExFiles\Box 50\5\ Scan259 | |
| Date | 1st November 1923 | |
| To RHC. {R. H. Coverley - Production Engineer} from EFC. {E. Fowler Clarke - Electrical Engineer} X4333 EFC {E. Fowler Clarke - Electrical Engineer} 5/T1.11.23. X.4333 - GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) DYNAMO ARMATURE. We are handing you herewith the armature taken from 49-GB dynamo. We have found an earth on this armature and an incorrect drop test, and we think it is due to copper cuttings from the process of undercutting having got down between the end of the commutator and the insulating ring, and getting in contact with the steel, as can be seen in two places. We can probably clear this ourselves, but considered it would be better for you to see the effect. In order not to hold the job up, we are utilising the armature from machine No.161, the commutator of which you have previously undercut for us by this process, and which is quite O.K. on similar test. E.F.C. EFC. {E. Fowler Clarke - Electrical Engineer} [Handwritten Signature] 1-11-23 RHC {R. H. Coverley - Production Engineer} | ||
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).