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).
Drawing comparing the typical bedding and tip sections of a 'Firths Spring' and a 'Woodhead' spring.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan114 | |
| Date | 29th September 1928 guessed | |
| PART SECTION AA{D. Abbot-Anderson} .300 1.200 .125 TYPICAL BEDDING FIRTHS SPRING A PART SECTION AA{D. Abbot-Anderson} 2.5 .300 .156 TYPICAL BEDDING WOODHEAD. ALL LEAVES SAME TIP SECTION | ||