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 sketch of original and present 'Buckingham Rack' profiles with a related gear mechanism.
| Identifier | ExFiles\Box 178\2\ img008 | |
| Date | 23th April 1940 guessed | |
| ORIG BUCKINGHAM RACK CIRC 45° ELL PRESENT BUCKINGHAM MAM | ||