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).
Specification table for a Weston standard Milli-Volt-Ammeter, detailing its electrical properties and connections.
| Identifier | ExFiles\Box 33\4\ Scan247 | |
| Date | 13th June 1929 | |
| X1782. 13.6.29. X.975 - ELECTRICAL EXPERIMENTAL DEPARTMENT INSTRUMENTS. X.1782. Description. Number and connections. Volt ranges Ampere ranges Resistances. (Ω) Remarks. Weston standard Milli-Volt-Ammeter 32901. .075 (at 20°C) 1.500 15.00 150.0 .011012 .1500 1.500 15.00 6.811 (at 20°C). (Temp. coeff. .196% per °C from 20°C). 136.22 1362.2 13622. -- -- -- Instrument only. Internal volt coils. External shunt box. Text from diagrams: Diagram 1: 150, 15, 1.5, o/s, + Diagram 2: 1.5, 15, 15, o/s, + | ||