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\ Scan205 | |
| Date | 1st January 1935 guessed | |
| -6- Description. | Number and connections | Volt ranges. | Ampere ranges. | Resistances. (ω). | Remarks. ---|---|---|---|---|--- Weston Box Instrument. Model 163. | 40 | .0168 (at 15°C.) | .00949 | 1.77 (At 15°C.) | Instrument only. | [Wiring diagram with labels: V, A, mtr, 0, 1.5, 15, 150, +] | .0168 (at 15°C.) | .01511 | 1.11 (at 15°C.) | Instrument shunted. | | 1.5 | X | 158 | Internal volt coil box. | | 15 | | 1580 | | | 150 | | 15800 | | | X | 1.5 | .0360 | Internal shunts. | | | 15 | .00392 | | ||