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).
Bumper test report for a front chassis spring, detailing Brinell hardness and test results for each leaf.
| Identifier | ExFiles\Box 119\2\ scan0130 | |
| Date | 14th October 1920 | |
| X/1331 BUMPER TEST - FRONT CHASSIS. K.2628 Spring F.4629 - 10 leaves, tapered ends with clips, nibs and slots. 900 lbs. Fitted to N.S. Bump Chassis 23.9.20. [STAMPED] RECEIVED OCT 14 1920 Time run No. of leaves. | Brinell. | Remarks. 1 | 444 | O.K. 2 | 415 | O.K. 3 | 444 | Broken in centre. 4 | 415 | " " " 5 | 415 | " " " 6 | 415 | " " " 7 | 415 | " " " 8 | 415 | " " " 9 | 415 | O.K. 10 | 415 | O.K. 15 hrs. 40 mins. Taken off 29.9.20. Spring F.4629 - standard spring - 10 leaves, nibs and slots, tie clips, tapered ends. 900 lbs. Fitted to N.S. Bump Chassis 29.9.20 - still O.K. [Handwritten top left]: 1/8 FC. | ||