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).
Test report on a tin-lead cartridge fuse to determine a suitable gauge and volt drop.
| Identifier | ExFiles\Box 166\7\ img006 | |
| Date | 6th June 1931 | |
| RR 538 (150 BKS.) (DB{Donald Bastow - Suspensions} 491-8-12-24) MP 306975 X. 6071 ROLLS-ROYCE LTD. INSTRUCTIONS. To: C.E. Date: 6th June 1931 Order No: D.D. 79 Customer's No.: 6071 Tin-lead Cartridge fuses We have tested a cartridge type fuse fitted with tin-lead wire using the smallest gauge we have on hand namely 22 SWG. A gradually increasing current was passed through it, the volt drop across the fuse only was noted. At 2.5 amps the drop was 0.3v. The current rose finally to about 13.0 amperes with a volt drop of about .85v. At intervals the current was restored to 2.5 amperes and the drop observed. It rose at this value to .085v finally. At 13.0 amperes the solder holding the wire melted. We estimate that a suitable gauge of tin lead wire for this purpose would be 27 swg and that the volt drop would be slightly less than with the... Signed: (Cowen) This Sheet must be filed on completion of the work. | ||