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 Model 1 Milli-Volt-ammeter, detailing connections, ranges, and resistances.
| Identifier | ExFiles\Box 33\4\ Scan201 | |
| Date | 1st December 1920 guessed | |
| 05667 -2- Description.: Weston Milli-Volt-ammeter Model 1. Number and connections.: 22407 BLACK. Volt ranges.: .0741 Amperes ranges.: .0149 Resistances (Ω): 4.97 (at 18°C) Remarks: Instrument only. Volt ranges - Normal: 1.5, 15, 30, 150, 600 Volt ranges - Actual: 1.516, 15.05, 30.09, 150.0, 601.8 Resistances: 101.6, 1010, 2018, 10060, 40360 Remarks: External volt coil box. Amperes ranges.: .15, 1.5, 15, 150, 600 Remarks: External shunts. (Marked ## 22596). | ||