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).
Note on the holving resistance ratio for Weston Instrument No. 92.
| Identifier | ExFiles\Box 33\4\ Scan188 | |
| Date | 22th March 1920 | |
| X.1782 22.3.20. X.1782 -- WESTON INSTRUMENT NO.92 X.2067. Holving resistance ratio for instrument No.92 on 15 volt range = 1.935. EFC. | ||