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).
Record of resistance measurements for various ampere shunts of a Weston Instrument.
| Identifier | ExFiles\Box 33\4\ Scan222 | |
| Date | 20th June 1925 | |
| X 1782 X.1782. WESTON INSTRUMENT. 20.6.25. Resistance of the various ampere shunts for Instrument No. 22596. .15 ampere range. Reading on 22407 (millivolts) = 51.9 " " 22596 (milliamps.) = 103.6 Resistance - .502 ohms. 1.5 Ampere Shunt. Reading on 22407 (millivolts) = 51.9 " " 22596 (milliamps.) = 590.3 Resistance .0880 ohms. 15 Ampere Shunt. Reading of 22407 (millivolts) = 51.9 " " 22596 (Amperes) = 7.35 Resistance .00707 ohms. 150 Ampere Shunt. Reading on 22407 (millivolts) = 51.9 " " 22596 (Amperes. ) = 51.7 Resistance .00104 ohms. 600 Ampere Shunt. Reading on 22407 (millivolts) = 32.6 " " 22596 (Amperes). = 155.2 Resistance .00021 ohms. EFC. | ||