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 report on a venturi flowmeter, measuring water flow at various engine revolutions.
| Identifier | ExFiles\Box 78\1\ scan0050 | |
| Date | 21th April 1920 | |
| Corrected figures. X.3563 (1) H R 235 A (100 T) (S.F. 846 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460 EFC X.3764 X.3563 21.4.20. 4.EX CAR+ TEST WITH VENTURI FLOWMETER. Venturi between Thermostat & Radiator. Thermostat full open - water 85º. Revs. | ins. of mercury. | galls. of water. 500 | 1/4" | 6.7 1000 | 3/4" | 11.65 1500 | 1 1/2" | 16.5 2000 | 2 3/8" | 20.5 Thermostat taken out but bypass left open. | ||