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).
Practically noiseless 28-slot armature for a 20 HP dynamo and requesting further production for testing.
| Identifier | ExFiles\Box 165\6\ img049 | |
| Date | 31th December 1926 | |
| To FHC from EFC. c. BY/RD. X/5861 EFC6/T31.12.26. 20 HP. DYNAMO. X.5661. A 20 HP. dynamo fitted with special expl. 28 slot armature has been proved by Mx.{John H Maddocks - Chief Proving Officer} as practically noiseless on each of four different chassis, and he says that he feels it would be a great advantage if the tests could be pushed forward so that the alteration can be introduced as soon as possible. We are asking the D.O. to instruct a similar armature for the 40/50, and also one for the 20 HP. with straight slots, to see whether the result with such is equally good, but in the meanwhile I shall be pleased if you will put in hand two further armatures of this 20 HP. expl. type with the 28 slots, to D.O. instruction BY/RD4/ML7.6.26. EFC. | ||