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).
The measured capacities of seven B.I. condensers borrowed from production.
| Identifier | ExFiles\Box 165\5\ img021 | |
| Date | 1st September 1930 | |
| X7700 9.30. CAPACITIES OF SEVEN B.I. CONDENSERS BORROWED FROM PRODUCTION. .44 mf. = 46% increase over std. .38 " = 27% " " " .35 " = 17% " " " .39 " = 30% " " " .38 " = 27% " " " .42 " = 40% " " " .42 " = 40% " " " 32% average. Production specification limits .275 to .325 mf. at 1 | ||