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 critical atmospheric temperature for spring tensioned versus positively tensioned fan belts on a 19 E.X. model at 62 M.P.H.
| Identifier | ExFiles\Box 29\3\ Scan213 | |
| Date | 2nd July 1938 guessed | |
| GRAPH V.{VIENNA} 19 E.X. 62 M.P.H. NO BONNET VENTILATION COMPARISON OF SPRING TENSIONED FAN AND FAN BELT TENSIONED POSITIVELY. CRITICAL ATS TEMP 40°C 30°C 20°C 10°C 40.5 SPRING TENSIONED. 44.5 BELT TIGHTENED Choc à Bloc | ||