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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).
Comparison table of particulars for 1150 lbs Firths and Woodhead front springs.

Identifier  ExFiles\Box 119\2\  scan0219
Date  5th November 1924
  
C O P Y.

5.11.24.

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 | .700 | .230 | 2.00 |
| 10TH. LEAF. | .425 | .210 | 2.00 | .450 | .235 | 2.00 |
| 11TH. LEAF. | .200 | .210 | 2.00 | .275 | .235 | 2.00 |
  
  


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