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).
Table of choke sizes and depression measurements for a Size 3 carburetter.
| Identifier | ExFiles\Box 20\9\ Scan015 | |
| Date | 29th October 1935 | |
| X1033 29.10.35. SIZE 3 CARBURETTER. Choke Size Depression Standard Duplex 1.3/16" 4.5" Daimlers Choke Size Singles to get power 1.5/16" 3" Largest chokes that can be got in 1.13/32" Wanted off Fisher Drawings | ||