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).
Investigating noise characteristics in machines, referencing static drag and armature design.
| Identifier | ExFiles\Box 165\6\ img131 | |
| Date | 29th June 1920 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. RR 236 (150 BKS.) (BHS7.29-6-20.) MP 224358 To__________________________________________19__ Order No.___________________ Customer's No. 5 Handwritten: specifics which can be applied to noisy machines with assurance of a cure. They suggest, however, that what may fail in one case may be beneficial in another. The static drag perceptible on individual teeth when the field is separately excited seems to have very little bearing on the noise characteristics of the machine concerned. As would be expected this drag is very sharp in the 21 slot case. The 28 slot armature seems likely to prove generally better than the present standard. Noise usually depends (in any one machine) on the degree of field excitation and the Signed_______________________ This Sheet must be filed on completion of the work. | ||