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 throttle governor performance for the 40/50 model with three different camshaft schemes.
| Identifier | ExFiles\Box 66a\3\ scan0075 | |
| Date | 29th April 1925 guessed | |
| X8140 ROAD SPEED M.P.H. NOTCHES MOVEMENT. HAND CONTROL 40/50 ROLLER CAM & BALL BEARING CAMSHAFT ROLLER CAM ORIGINAL SLIDING CAM COMPARISON OF THROTTLE GOVERNOR PERFORMANCE 40/50 & THREE E.A.C. SCHEMES TEST CONDUCTED BY ADVANCING HAND CONTROL NOTCH BY NOTCH UP TO A GIVEN SPEED & THEN RETARDING IT IN THE SAME MANNER. | ||