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 results for thermostat performance with different diaphragm hole sizes.
| Identifier | ExFiles\Box 78\1\ scan0062 | |
| Date | 28th May 1920 | |
| E.F.C. X.3563. 28.5.20. X.2631 49-GB CAR. X.3563 TESTS WITH DIFFERENT HOLES IN DIAPHRAGM FITTED IN THERMOSTAT. 50°C 1 mins. 44 secs. .0625" in Thermostat diaphragm(start 17°) 60°C 2 " 18 " 70°C 3 " 3 " Radiator outlet 52°C. at 15 mins. 75°C 3 " 33 " 55° at 18 mins. 80°C 4 " 17 " 50°C 1 ". 35 " .098" in Thermostat diaphragm. 60°C 2 ". 18 " Start 17°. 70°C 3 ". 7 " Radiator outlet - 75°C 3 ". 34 " 50° at 15 mins. 80°C 4 ". 18 " 52° at 18 mins. 50°C 1 ". 55 " .1875" in diaphragm. 60°C 2 ". 53 " Start 18°. 70°C 4 ". 12 " Radiator outlet - 75°C 5 ". 5 " (— at 15 mins.) test 80°C (— at 18 mins.) stopped. E F C MAY 31 1920 RECEIVED. | ||