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).
Data table of temperature and time readings from a series of cooling system tests under different configurations.
| Identifier | ExFiles\Box 75\4\ scan0065 | |
| Date | 17th August 1911 | |
| R.R. 148 (20 H) (W 730. 17.8.11) C X819 Atmos. Water Flowboards Time Conditions Temp. Temp. Top Under 21°c | 75° | 30 | 42 | 0 21°c | boiled | 28 | 48 | 5 | Both side guards closed, standard bonnet no dash screen. 25°c | 75° | 30 | 46 | 0 22°c | boiled | 30 | 50 | 7 | Both side guards closed Louvred bonnet no dash screen. 21°c | 75° | 24 | 30 | 0 21°c | boiled | 25 | 34 | 5 | Dash screen in side guards closed, louvred bonnet. 21°c | 75° | 24 | 34 | 0 21°c | boiled | 25 ½ | 37 ½ | 6 | Dash screen in, louvred bonnet; side guards open. 16°c | 75° | 18 | 22 | 0 16°c | boiled | 18 | 27 | 5 ½ | Dash screen in, standard bonnet side guards open. | ||