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).
Blueprint comparing two different leaf spring designs, Firths and Woodhead.
| Identifier | ExFiles\Box 52\2\ Scan187 | |
| Date | 25th October 1928 guessed | |
| PART SECTION AA {D. Abbot Anderson} .300 1.200 .125 TYPICAL BEDDING FIRTHS SPRING PART SECTION AA {D. Abbot Anderson} .300 2.500 .186 TYPICAL BEDDING WOODHEAD. ALL LEAVES SAME TIP SECTION | ||