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).
Bar graph comparing critical ATS temperature for a spring tensioned fan versus a positively tensioned fan belt.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan107 | |
| Date | 26th June 1930 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 | ||