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 amount of oil for D.2, D.1, and D.O. central lubrication drip plugs.
| Identifier | ExFiles\Box 27\1\ Scan161 | |
| Date | 11th April 1929 | |
| Y3866 Hs{Lord Ernest Hives - Chair}/Gyl=LG11.4.29. Mr. Hancock from Hs{Lord Ernest Hives - Chair}/GY. CENTRAL LUBRICATION. D.2., D.1. and D.O. drip plugs should give the same amount of oil as the corresponding S. numbers i.e., 23, 13, 5 drops per stroke of the pump. Hs{Lord Ernest Hives - Chair}/Gaye. | ||