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 sheet detailing the fusing currents for various gauges of tin-lead fuse wire used in Lucas and R.R. switch boxes.
| Identifier | ExFiles\Box 61\2\ scan0330 | |
| Date | 23th March 1920 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 X.2515. 194 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: MC Clark Date: 23/3/20 19 Order No: X 2515 Customer's No.: — Fusing Currents of fuse wire in Lucas + R.R. Switch boxes. All fuse wires being Tin-lead. Table: Column 1 Header: Diam. Column 2 Header: Gauge S.W.G Column 3 Header: Lucas Fusing Current Column 4 Header: R.R. Fusing Current Row 1: .009, 34, 2.7 Amp, — Row 2: .013, 30, 3.3 ", 4.0 Row 3: .028, 22, 10.0, 12.5 Row 4: .032, 21, 14.0 ", 16.0 Row 5: .035, 20, 17.0 ", 18.0 Row 6: .041, 19, 21.0 ", 24.0 Note: Small quantity only Signed This Sheet must be filed on completion of the work. | ||