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).
Comparison of different fuse wires against a standard tin fuse wire, showing their respective melting currents.
| Identifier | ExFiles\Box 61\2\ scan0420 | |
| Date | 17th November 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 X.2575 91242 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No. P.A.39. Re X. 2515. Customer's No. Nov. 17th 1920 Comparison of fuse wires with Standard tin fuse wire. The current values given below are the lowest at which their respective wires will melt. | Test | Specimen of wire | Dia." | S.W.G | Amps | |------|--------------------|--------|-------|------| | 1. | Standard. | .0124 | 30 | 4.0 | | 2. | New wire received | .0124 | 30 | 4.0 | | 3. | Smith cut-out wire | .010 | 33 | 2.9 | Signed C.A.P. This Sheet must be filed on completion of the work. | ||