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).
Test log sheet recording water temperature against atmospheric temperature under different driving conditions.
| Identifier | ExFiles\Box 75\4\ scan0067 | |
| Date | 8th September 1911 | |
| R.R 148 (20 H) (W. 819 8.9.11) G 1919. Water temperature tests same conditions Atmos Temp Water Temp Thoroubreds Tips side Conditions 13° 71 1/2° Start from Macclesfield Run with whole side 12° 90° after 10 mins run as guard out each side 12 93 1/2° other tests at the top Cat & Fiddle With 3 louvres taken out each side guard it made no difference & bubbled after 10 mins run | ||