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).
Comparison of specifications for 1150 lbs Firths and Woodhead front spring leaves.
| Identifier | ExFiles\Box 72\3\ scan0202 | |
| Date | 5th November 1924 | |
| COPY. EAC.111. FRONT SPRINGS. We give below particulars of 1150 lbs. Firths and (Woodhead) Front Springs :- | | FIRTH SPRING LEAVES. | | WOODHEAD SPRINGS. | | |---|---|---|---|---|---|---|---| | | Initial Camber. | Thickness of leaf. | Width of leaf. | Initial Camber. | Thickness of leaf. | Width of leaf. | | TOP LEAF. | .625 | .310 | 2.00 | 1.050 | .290 | 1.975 | | 2ND. LEAF. | 2.00 | .250 | 2.00 | 1.437 | .255 | 1.975 | | 3RD. LEAF. | 1.950 | .250 | 2.025 | 1.700 | .255 | 1.990 | | 4TH. LEAF. | 1.800 | .250 | 2.00 | 1.750 | .235 | 2.00 | | 5TH. LEAF. | 1.550 | .235 | 2.025 | 1.750 | .230 | 2.00 | | 6TH. LEAF. | 1.375 | .230 | 2.015 | 1.550 | .235 | 2.00 | | 7TH. LEAF. | 1.125 | .220 | 2.015 | 1.250 | .235 | 2.00 | | 8TH. LEAF. | .900 | .220 | 1.985 | .975 | .235 | 2.00 | | 9TH. LEAF. | .750 | .215 | 2.025 | .800 | .230 | 2.00 | | 10TH. LEAF. | .425 | .210 | 2.00 | .450 | .235 | 2.00 | | 11TH. LEAF. | .200 | .210 | 2.00 | .275 | .235 | 2.00 | | ||