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).
Comparative times for engine water heat-up under no load with different thermostat and bye-pass configurations.
| Identifier | ExFiles\Box 38\2\ Scan105 | |
| Date | 26th June 1919 guessed | |
| Engine run with car standing at 1000 R.P.M. - no load. Comparative Times taken by heat up water. Temp. Standard car - no Thermostat or blanking plates. Thermostat fitted .062" bye-pass. Thermostat fitted .100" bye-pass. Thermostat fitted .187" bye-pass. 17° Start. Start Start Start. 50° 2mins. 49 secs. 1 min. 35 secs. 1 min. 40secs. 1 min. 55 secs 60° 6 " 23 " 2 " 18 " 2 " 18 " 2 " 53 " 70° 23 " 2 " 3 " 3 " 3 " 7 " 4 " 22 " 80° 71°C max. Temp. 4 " 17 " 4 " 28 " 8 " 0 " Temperature measured with thermometer in standard position on top water pipe. Hs.{Lord Ernest Hives - Chair} | ||