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).
Instruction to experimentally build a 28 slot, 56 commutator segment straight slot armature for a 20 HP Dynamo.
| Identifier | ExFiles\Box 165\6\ img051 | |
| Date | 4th January 1927 | |
| To EY/RD. from EFC. Y5661 EFC6/T4.1.27. 20 HP. DYNAMO. X.5661. Would you please instruct up experimentally one 28 slot 56 commutator segment straight slot armature to the special winding D.51491. EFC. | ||