Graph showing the automatic advance of the cam with speed for Sointilla magnetos, types AG8-A and AN8-A.
| Identifier | ExFiles\Box 48\2\ Scan039 | |
| Date | 30th January 1924 guessed | |
| AUTOMATIC ADVANCE OF CAM WITH SPEED ON SOINTILLA MAGNETOS TYPES AG8-A and AN8-A X.4187 AG8-A { AUTOMATIC RANGE = 22°±½, 24° ON CRANK HAND RANGE = 17.5°, 35° E {Mr Elliott - Chief Engineer} /O = 5°, 10° } AN8-A TC-75 { AUTOMATIC RANGE = 30°, 24 ON CRANK HAND RANGE = 20°, 10-14° TOTAL = 50.5°, 70°±4° } Y-AXIS LABELS: CAM ADVANCE DEGREES MAGNETO DEGS X-AXIS LABELS: MAGNETO SPEED (R.P.M.) 1/2 ENGINE SPEED (R.P.M.) | ||
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).