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).
Blueprint for a Radiator Filler Cap Modification for the Phantom II.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan090 | |
| Date | 7th February 1930 guessed | |
| RADIATOR FILLER CAP MODIFICATION PHANTOM II UNDERCUT 2.360 DIA X .150 WIDE RADIATOR CAP ALL OTHER DIMENSNS AS ON E-70868 1.900 DIA 2.350 1.900 DERMATINE WASHER .125" THICK | ||