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).
Note on the different gauges of marked and unmarked cartridge type field fuses from experimental stock.
| Identifier | ExFiles\Box 166\7\ img009 | |
| Date | 4th February 1931 | |
| X6071. 4.2.31. X6071, X.4629. CARTRIDGE TYPE FIELD FUSES (EXPL. STOCK) Four fuses marked on ends contain finer gauge than standard. Six unmarked fuses contain courser gauge than standard. | ||