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 detailing the fusing currents for various gauges of copper wire.
| Identifier | ExFiles\Box 61\2\ scan0417 | |
| Date | 24th January 1919 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 88241 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No. Customer's No. 2 Re Copper wire Fusing Currents | Gauge | Diameter | Fusing current Amps | Remarks. | |--------|----------|---------------------|------------| | 39 | .005" | 6.0 | | | ✓ 34 | .009" | 17.0 | | | ✓ 32 | .0105" | 24.0 | Tinned | | 29-30 | .013" | 29.0 | Oxydized | | 28 | .015" | 50.0 | | Signed Francis J Allen. This Sheet must be filed on completion of the work. | ||