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 satisfactory initial status of a new type P&R moulded vent plug, with plans for a 10,000-mile test.
| Identifier | ExFiles\Box 168b\3\ img256 | |
| Date | 30th January 1930 | |
| X7535A E.F.G. 30-1-30. JD{J. Draper - Frames}50 X7535P New Type P&R Moulded vent plug The new type P&R vent plug which is moulded in "Dagenite" & having the thread similar to the Ebonite, is satisfactory as far as we have gone. The best test of these will be on the 10,000 mile car, when it should be noted if they allow any acid spray to take place at all during running. I am under the impression that it was agreed verbally between Messrs Minchin & Pritchett of P&R & ourselves to adopt this as standard, & taking their word that it had been tested & found in every way satisfactory. L.J. | ||