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 results for two six-leaf springs detailing Brinell hardness, run times, and wear patterns.
| Identifier | ExFiles\Box 80\2\ scan0318 | |
| Date | 9th August 1920 | |
| g.F.c x.3981 SPRING F.363 - 220 lbs. - parallel leaves - tapered ends - no nibs and slots - ground all over. x.1331/ Full Fitted on O.S. Bump Chassis 3.8.20. No. of leaves 6. Brinell. Remarks. Time run. 1 444 1st. leaf O.K. 2 415 2nd. leaf cracked under rear clip. 17 hrs. 30 mins. 3 415 3rd. leaf very small crack under rear clip 4 415 4th. leaf cracked front of first clip. 5 415 5th. leaf cracked front of first clip. 6 415 6th. leaf O.K. Spring taken off 7.8.20 RECEIVED AUG 9 1920 SPRING F.363 - 2100 lbs. - parallel leaves, tapered ends - no nibs and slots - ground all over. Fitted to N.S. Bump Chassis 27.7.20. 1 444 1st. leaf cracked under front clip. 16 hrs. 15 mins. 2 415 1st. leaf broken. 18 " 35 mins. 3 429 3rd. leaf broken front of clip. 23 " 4 415 2nd. leaf cracked front of clip. 25 " 45 " 5 415 4th. leaf cracked under front clip. 6 444 5th. and 6th. leaves O.K. Spring taken off 7.8.20. R.R. 238A (100 'D') S.G. 048. 19-2-20 G 2618 | ||