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).
Graph comparing bonnet air temperatures for a thermostatically controlled shutter system versus a bypass system at different speeds.
| Identifier | ExFiles\Box 87\1\ scan0093 | |
| Date | 19th September 1934 guessed | |
| SHEET 6 COMPARISON OF BONNET AIR TEMPS WITH (a) THERMOSTATICALLY CONTROLLED SHUTTER SYSTEM (b) THERMOSTATICALLY CONTROLLED BYPASS SYSTEM AIR TEMP THRO' OUT TESTS - 20°C THERMOSTATS GIVE APPROX EQUAL TOP WATER TEMPS IN BOTH (a) & (b) TESTS SHUTTER SYSTEM BY-PASS SYSTEM BONNET AIR TEMP °C (ACTUAL) M.P.H. 30 LIGHT 60 LIGHT | ||