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 of pressure face diameters given by standard cam forms for a No. 14 cam.
| Identifier | ExFiles\Box 170\2\ img231 | |
| Date | 10th December 1934 guessed | |
| TAKEN AT 68° F GRAPHS OF PRESSURE FACE DIAMETERS GIVEN BY STANDARD CAM FORMS Nº 14 CAM. MAJOR AXIS .000" .001" .002" .003" .004" .005" .006" .007" .008" 27° 36° 45° | ||