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).
Sketch showing the results of decarbonisation tests on various road springs.
| Identifier | ExFiles\Box 154a\4\ scan0060 | |
| Date | 7th December 1937 | |
| SKETCH SHOWING DECARBURISATION LABORATORY. IN ROAD SPRINGS. 7. 12. 37 WOODHEAD SPRING N° 24 MAIN PLATE BROKEN THROUGH EYE AFTER 11 1/4 HOURS. .006" UPPER SURFACE. .004" TRANSVERSE SECTION NEGLIGIBLE APPROX. 3" FROM FRACTURE. FIRTH'S N°1 SPRING - BROKEN MAIN PLATE AFTER 20 HRS. STARTING POINT OF FRACTURE .008" UPPER SURFACE. .009" TRANSVERSE SECTION JUST BENEATH FRACTURE. .004" FIRTH'S N° 2 SPRING - BROKEN MAIN PLATE AFTER 19 HRS. 40MINS STARTING POINT OF FRACTURE .003" .005" .005" UPPER SURFACE. NIL TRANSVERSE SECTION JUST BENEATH FRACTURE. NIL .005" AMERICAN SPRING - UNBROKEN SMALL PLATE - NOT TESTED. .004" .004" UPPER SURFACE. .004" .005" .003" .003" .003" TRANSVERSE SECTION APPROX. 3" FROM END OF PLATE. M.1486. ---- DOTTED LINE INDICATES DECARBURISATION | ||