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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).
Summary table of bump test results for six different springs.

Identifier  ExFiles\Box 43\2\  Scan255
Date  16th October 1928 guessed
  
SUMMARY OF LAST SIX SPRINGS ON BUMP TEST.

No. | Make. | Wt. lbs. | Material. | Type. lbs. | Length. | Initial camber after test. | Loaded on lbs. | Position on bump. | Drg. No. | Total Hrs. run. Hs.{Lord Ernest Hives - Chair}ms. | REMARKS & BREAKAGES.
1 | Firths special | 41 | Silico Manganese. | 1100 | 43 1/4" | 3 3/16 | | N.S. | | 13 45 | Top leaf 1 1/4" from centre front end
2 | " | " | " | " | " | | | O.S. | | 15 45 | Top leaf 8" from rear anchorage.
3 | Firths 'B' | " | " | " | " | 3 1/2" | 1120 | N.S. | G.3159. DG.F.T.F +S. | 22 20 | Top leaf 9" from rear.
4 | " | " | " | " | " | 3 7/32" | 1109 | O.S. | G.3158. DG.F.T.F +S. | 40 35 | Top leaf 9" from rear. 7th.leaf from bottom.
5 | D.{John DeLooze - Company Secretary} type. | " | " | " | " | 3 1/4" | 1104 | O.S. | G.3172. DG.F.T.F +S. | 30 40 | After 24 hrs. 45 mins. 4th. leaf from top broke at first spring clip. At 30 hrs. 40 ms. top leaf broke 8" from R.{Sir Henry Royce}
6 | " | " | " | " | " | 3 1/4" | 1104 | N.S. | G.3171 DG.F.T.F | | After 28 hrs. 30 mins 4th.leaf from top broke at first spring clip same as No. 5 spring. This spg is still running. Run 55 hrs. so far.
  
  


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