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).
Specifications for two high-output 20-HP chassis dynamos with half-charge control.
| Identifier | ExFiles\Box 62\3\ scan0037 | |
| Date | 8th March 1930 | |
| RMC. c. EFC. X6005 BY/RD2/DM.{D. Munro}8.3.30. X.6005 X.6016 20-HP. Chassis Dynamo for use with Half-Charge Control. Will you please put in hand two dynamos to the following part lists which are high output machines and which it is intended to use with the half-charge control switching scheme now in hand :- Section 8070. Armature. L.O.P. D.51733. With the exception of the number of slots and the armature winding, the rest of the parts on this section are standard production pieces. Section 8080. Bearing Brkts. etc. L.O.P. D.50958. All parts standard in every way, control brush to be set as required. Section 8090. Commutator. L.O.P. D.51738. .Commutator bars new, all other parts standard. Section 8100. Frame & Field Winding. L.O.P. D.51884. All parts standard except the poles which can be produced from the standard pieces. We attach herewith blueprints of D.51883 Pole for Dynamo and D.51884 Frame & Field Winding L.O.P. All other special blueprints were issued to you in our memo BY/RD14/N.3.5.29. Will you please treat this as urgent. BY/RD. | ||