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).
Scale calibration data for a revolution indicator, instrument number 1589, fitted to chassis B.35-AE.
| Identifier | ExFiles\Box 90a\2\ Scan264 | |
| Date | 8th August 1934 guessed | |
| FILE RR HOLLS CAR (3) D7962. Revolution Indicator. Instrument No.1589. Scale Calibration :- Dial Reading (R.P.M. x 100) Revs. per min. of Drive Shaft. Percentage error. Fast. Slow. 5 114 8 10 234 6.4 15 360 4 20 487 2.6 25 613 1.22 30 737 1.77 35 864 1.26 40 993 0.7 45 1115 0.88 50 1237 1.3 Remarks:- 10º - 30º / 1% - 1.5% slower. Fitted to Chassis No.- B.35-AE. G.H.Ratcliffe. | ||