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).
The use of punched armature plates for a 20 HP motor.
| Identifier | ExFiles\Box 61b\3\ scan0195 | |
| Date | 21th June 1927 | |
| To BY/RD. from EFC. X5620 EFC3/T21.6.27. X4132 X5620 PUNCHED ARMATURE PLATES FOR 20 HP. MOTOR. Referring to your EX/RD4/ML24.5.27, you remarked :- "It was considered worth while trying a series of motors with punched plates and no micas and benefiting by the saving in cost of mica plates". So far as we can gather we have not yet taken any steps to adopt punched plates on this motor. EFC. | ||