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 two leaf spring designs from Firths and Woodhead, showing bedding and tip sections.
| Identifier | ExFiles\Box 67a\2\ scan0199 | |
| Date | 25th February 1928 guessed | |
| Left drawing: PART SECTION A.A, <--1.200-->, .300, ↓ .125, TYPICAL BEDDING, FIRTHS SPRING. Right drawing: PART SECTION A.A, <--2.500-->, .300, ↓ .156, TYPICAL BEDDING, WOODHEAD. ALL LEAVES SAME TIP SECTION. | ||