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).
Table of fusing currents for different gauges of copper wire.
| Identifier | ExFiles\Box 61\2\ scan0498 | |
| Date | 17th May 1929 | |
| X25/5 17.5.29 TABLE OF FUSING CURRENTS OF COPPER WIRE. Gauge No. Fusing current (amperes) Area (unit .0001 sq.inch) Ratio Fusing current/area 40 4 .23 17.4 38 6 .36 16.7 36 8 .58 13.8 34 11 .85 12.9 32 14 1.16 12.1 30 18 1.54 11.7 28 24 2.19 11.0 26 32 3.24 9.9 24 42 4.84 8.7 | ||