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).
Calibration note for an Ediswan Voltmeter Type MC.No.62953.
| Identifier | ExFiles\Box 165\3\ img061 | |
| Date | 25th June 1927 | |
| x275 6033 To HY{Tom Haldenby - Plant Engineer}/EJJ. from EFC. EFC3/T25.6.27. EDISWAN VOLTMETER TYPE MC.No.62953. We have carefully calibrated this instrument. The scale proportionality is quite fair. The addition of 3% to all readings will give quite an accurate correction. EFC. | ||