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 and wiring diagram for a Weston Box Instrument, Model 163.
| Identifier | ExFiles\Box 33\4\ Scan206 | |
| Date | 28th January 1921 guessed | |
| -7- | Description | Number and connection. | Volt ranges. | Ampere ranges. | Resistances. (ω) | Remarks. | |------------------------------|----------------------------------------------------------------------------------------------------------------------|--------------------|----------------|------------------|--------------------------------| | | 98. | .0168 (at 15°C). | .0105 | 1.600 (at 15°C) | Instrument only. | | Weston Box Instrument Model 163. | [Wiring diagram showing connections for a voltmeter and ammeter. Labels include: 1.5, V, 15, 150, +, motr., A, -, +] | .0497 (at 18°C). | .0188 | 2.64 (at 18°C) | Between external shunt terminals. | | | | 1.5, 15, 150 | X | 142.9, 1429, 14290 | Internal volt coil box. | | | | X | 1.5, 15 | .0333, .00331 | External shunts. | | ||