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).
Table of specifications for electrical experimental department instruments.
| Identifier | ExFiles\Box 165\3\ img024 | |
| Date | 1st December 1920 | |
| X-275. 6033 X.975 - ELECTRICAL EXPERIMENTAL DEPARTMENT INSTRUMENTS. X.1782. Description. Number and Connections. Volt ranges. Ampere ranges. Resistances. (Ω). Remarks. Weston Standard Milli-Volt-Ammeter Model 1. 32901. .075 (at 18°c.) 1.500 15.00 150.0 .011005 6.815 (at 18°c.) (Temp Coeff: .196% per °c. from 18°c.) 136.30 1363.0 13630. Instrument only. Internal volt coils. * .1500 1.500 15.00 External shunt box. | ||