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 chart for various types of electrical wire.
| Identifier | ExFiles\Box 168b\2\ img034 | |
| Date | 1st July 1920 guessed | |
| R.R. CHASSIS WIRE NO. | 1 | 2 | 3 | 4 | 5 NUMBER of CORES. | 1 | 1 | 1 | 2 | 2 CORE SIZES | 84/26 | 40/36 | 70/36 | 40/36 | 90/36 CROSS SECTIONAL AREA □" | .0264 | .00182 | .00318 | .00182 | .004 CURRENT CARRYING CAPACITY at 5000 A/□" | 132 | 9.1 | 15.9 | 9.1 | 20.- OHMS per 1000' at 40°C | .333 | 4.82 | 2.75 | 4.82 | 2.16 OUTSIDE DIAMETER INCHES. | .435 | .195 | .210 | .372 | .42- NOTE. 5000 AMPS PER □" AT 40°C ON COPPER WIRE CORRESPONDS | ||