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 plotting engine RPM against quadrant notches to show governor lag for a Standard Silver Ghost.
| Identifier | ExFiles\Box 66a\3\ scan0105 | |
| Date | 30th November 1926 guessed | |
| GOVERNOR LAG (CHASSIS 5 E.X.) STANDARD SILVER GHOST. ENGINE R.P.M. 1500 1250 1000 750 500 250 0 5 10 15 20 25 30 NOTCHES ON QUADRANT. DOWN UP FIG VII | ||