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).
Component testing log detailing parts, their operational hours, and resulting improvements or failures.
| Identifier | ExFiles\Box 119\2\ scan0411 | |
| Date | 10th January 1936 | |
| -3- Hs{Lord Ernest Hives - Chair}/Les.3/KW.10.1.36. Part | Hours Run | Improvement in Production Part ---|---|--- 3" CAMS. | | Firth's outer spring G.83271 | 22 hrs. 45 min. | Salter's springs for first 30 chassis. Spring box cracked G.81515 (alum. bronze) - (bad casting). | 450 hrs. 2" cams, 22 hrs. 45 mins, 3" cams. | Forged steel. Suspension lever G.81431. | 473 hrs. 2" cams, 26 hrs. 3" cams. | Replaced by G.83636. Suspension lever G.81431. | 40 hrs. 40 mins. | Replaced by G.83636. Suspension lever, G.83636. | 30 hrs. | Vital section considerably less than drawing. Firth inner spring, G.83270. | 32 hrs. 30 mins. | Salter's springs used. Salter's outer spring G.83271. | 57 hrs. | Stress reduced 8%. 2 top triangle levers G.82851/3. | 305 hrs. 2" cams, 126 hrs. 3" cams. | Replaced by N.Sch.4634. Failure of .250" dia. studs securing spring box to frame. | 450 hrs. 2" cams, 147 hrs. 3" cams. | .312" dia. studs used. | ||