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 test report for an A.C. Rev-Counter, instrument number II.
| Identifier | ExFiles\Box 165\2\ img107 | |
| Date | 13th July 1937 | |
| 6BIV 13.7.37. A.C. Rev-Counter. Instrument No.:- II Scale Calibration :- Dial Reading (R.P.M. x 100) Revs. per min. of drive shaft. Percentage error. Fast Slow 5 125 - - 10, 250 - - 15 370 1.35 20 485 3.09 25 618 1.13 30 738 1.63 35 870 0.58 40 990 1.01 45 1107 1.62 50 1206 1.58 Remarks :- Fitted to Chassis No.:- | ||