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 sheet detailing an investigation into machine noise and proposing modifications to armature slots and pole edges.
| Identifier | ExFiles\Box 165\6\ img133 | |
| Date | 29th June 1926 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. y machine; it is said in the production dept that a high degree of manufacturing accuracy is conducive to noise rather than the reverse. It is proposed to try the effect of exaggerating the relative staggering of armature slots in relation to the poles in a further machine (C.70) received for noise investigation, by sloping the edges (or trailing edge only) of the pole oppositely to the armature slot slope. Tests reported in AC 73 / 13-IV-26., indicated that the staggering is beneficial progressively up to the amount at present employed (one tooth-slot pitch) and a further improvement may be made by increasing etc. Signed [Signature] This Sheet must be filed on completion of the work. [Top left corner text: RR 238 (100 BKS.) (BH57-29-6-26.) MP 224358] | ||