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 sheet for an Electrical Experimental Department instrument, the Weston Standard Milli-Volt-Ammeter Model 1.
| Identifier | ExFiles\Box 33\4\ Scan200 | |
| Date | 1st December 1920 | |
| X.1782 1.12.20. X.975 - ELECTRICAL EXPERIMENTAL DEPARTMENT INSTRUMENTS. X.1782. TABLE HEADERS: Description. Number and connections. Volt ranges. Ampere ranges. Resistances. (ω). Remarks. TABLE CONTENT: ROW SET 1: Description: Weston Standard Milli-Volt-Ammeter Model 1. Number and connections: 32901. Volt ranges: .075 (at 18°C.) Ampere ranges: .011005 Resistances: 6.815 (at 18°C.) (Temp. Coeff: .196% per °C. from 18°C.) Remarks: Instrument only. ROW SET 2: Number and connections: [Diagram of internal connections for volt coils. Terminals labeled 150, 1.5, 15, .075, +, -] Volt ranges: 1.500, 15.00, 150.0 Ampere ranges: [Crossed out] Resistances: 136.30, 1363.0, 13630. Remarks: Internal volt coils. ROW SET 3: Number and connections: [Diagram of external shunt box connections. Terminals labeled 1.5, 15, .15, +] Volt ranges: [Crossed out] Ampere ranges: .1500, 1.500, 15.00 Resistances: --- Remarks: External shunt box. | ||