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).
Analysis and life comparison of six Woodhead springs, detailing their physical properties and chemical composition.
| Identifier | Morton\M3.4\ img038 | |
| Date | 20th September 1924 | |
| -3- Hel/LG20.9.24. Analysis of 6 Woodhead Springs. ANALYSIS OF TOP LEAF. No. of spring. | Load lbs. | Life. hrs.mins | Thickness of Top Leaf. | Brin-nel. | Carbon. | Mangan-ese. | Chromium. | Silicon. | Phosph-orus. | Sulphur. 1 | 950 | 23 5 | .282" | 375 | .53% | .54% | 1.08% | 1.05% | .030% | 2 | 950 | 17 42 | .282" | 388 | .50% | .56% | 1.06% | .82% | .042% | 3 | 1000 | 29 6 | .286" | 388 | .40% | .54% | 1.02% | .72% | .047% | 4 | 1000 | 18 5 | .293" | 388 | .47% | .58% | .81% | .94% | .032% | .023% 5 | 950 | 20 1 | .292" | 363 | .40% | .37% | .97% | .94% | .030% | .030% 6 | 1000 | 20 58 | .300 | 363 | .55% | .56% | 1.00% | .65% | .027% | .030% N.B. The sulphur content for springs Nos. 1, 2 and 3 was not estimated exactly but was found to be quite normal. Some of these springs are slightly higher in manganese and chromium than is usual, otherwise they are normal. Comparison of Life of Spring when classified under Load. Life of spring (in hrs. mins) DETAILS. | 950 lbs. | 1000 lbs. | 1050 lbs. | 1100 lbs. | 1150 lbs. | 1200 lbs. | 1250 lb Firth 25% | 14 - 38 | 14 - 0 | 18 - 43 | | 18 - 52 | 24 - 43 Life of Individual Springs. | | 10 - 4 | 14 - 0 | 15 - 35 | | 19 - 5 | 27 - 48 | 15 - 30 | 11 - 11 | 13 - 16 | | 13 - 23 | 18 - 30 | 13 - 40 | 13 - 4 | 9 - 25 | | | 23 - 26 | 15 - 7 | 17 - 45 | 21 - 1 | | | 23 - 40 | 10 - 40 | 10 - 44 | 13 - 16 | | 10 - 51 | 13 - 16 | 14 - 17 | 14 - 35 | | 16 - 7 | 23 - 37 Average Life | ||