Bar chart comparing critical atmospheric temperatures for a spring tensioned fan versus a positively tensioned fan belt at 62 M.P.H.
| Identifier | ExFiles\Box 15\1\ Scan293 | |
| Date | 2nd July 1938 guessed | |
| GRAPH V 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 SPRING TENSIONED 40.5 BELT TIGHTENED. CHOC à BLOC 44.5 | ||
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).