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).
Hand-drawn diagram of a top leaf with dimensions.
| Identifier | ExFiles\Box 52\2\ Scan145 | |
| Date | 7th April 1927 guessed | |
| Top leaf. Ø 3.5" J 3 | ||