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 of the chemical composition and operational life of six Woodhead front springs under various loads.
| Identifier | ExFiles\Box 72\3\ scan0137 | |
| Date | 23th September 1924 guessed | |
| -3- Analysis of 6 Woodhead Front Springs. ANALYSIS OF TOP LEAF. No.of spring. | Load lbs. | Life. hrs.mins. | Thickness of Top Leaf. | Brin-ell. | Carbon. | Mangan-ese. | Chromium. | Silicon. | Phosph-orus. | Sulphur. 1 | 950 | 23 5 | .282"* | 375 | .53% | .54% | 1.08% | 1.05% | .030% | y 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 estimate 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 Front Springs when classified under load. Life of spring (in hrs. and mins.) DETAILS. | 950 lbs. | 1000 lbs. | 1050 lbs. | 1100 lbs. | 1150 lbs. | 1200 lbs. | 1250 lbs Firths 25% | | 14 - 38 | 14 - 0 | 18 - 43 | | 15 - 52 | 24 - 43 Life | 10 - 4 | 14 - 0 | 15 - 35 | | 19 - 5 | 27 - 48 of | 15 - 30 | 11 - 11 | 13 - 16 | | 13 - 23 | 18 - 30 individual | 13 - 40 | 18 - 4 | 9 - 25 | | | 23 - 26 Springs. | 15 - 7 | 17 - 45 | 21 - 1 | | | 23 - 40 | 10 - 40 | 10 - 44 | 13 - 16 | | | | | | 10 - 51 | | | Average life | 13 - 16 | 14 - 17 | 14 - 35 | | 16 - 7 | 23 - 37 | ||