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).
Laboratory report on the viscosity tests of Sperm, Gas engine, and Lard oils at different temperatures.
| Identifier | ExFiles\Box 65\1\ scan0065 | |
| Date | 29th January 1925 | |
| COPY. X8G85 Hs.{Lord Ernest Hives - Chair} for Mr.Robotham. H17/EA29.1.25 Laboratory. As requested we have made tests on the oils submitted and have obtained the following results :- Oil. Viscosity at 15 C Viscosity at 28 C. Sperm 695 seconds 295 seconds Gas engine 2525 " 780 " Lard 571 " 235 " The viscosity of lard oil at 24 C was found to be the same as that of Price's Motorine "C" at 50 C i.e. 350 secs. We attach a viscosity curve for Motorine "C". H1. P.T.O | ||