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).
Enquiry to The Cambridge Instrument Co. about the capabilities of their rotational accelerometer for measuring crankshaft vibrations.
| Identifier | ExFiles\Box 175\4\ img148 | |
| Date | 23th October 1933 | |
| V 395 P. Experimental Dept. Hs{Lord Ernest Hives - Chair}/Cry.6/KT. Oct 23rd 1933; The Cambridge Instrument Co. Ltd., Cambridge. For the attention of Mr. Collins. Dear Sirs, You may remember some time ago that we were interested in your rotational accelerometer. At that time the instrument recorded on a celluloid strip and a microscope was required to measure the results. It is possible that if the instrument were direct recording it might be very useful to us. When measuring crankshaft torsional vibrations we always know the frequency, the amplitude of which we wish to measure. The maximum acceleration we require to measure is of the order of ± 30 three times per revolution of a shaft rotating at 5000 r.p.m.; and normally about one tenth of this amount. Will you please let us know whether your instrument would meet the case. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||