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).
Investigation into the contact breaker motion of a Dixie Model 20 motorcycle magneto at high speeds, including a diagram of the test setup.
| Identifier | ExFiles\Box 36\1\ scan 107 | |
| Date | 22th June 1917 | |
| c. to J.W. c. to Dy.{F R Danby} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} X.2799 - DIXIE MODEL 20 TWO CYLINDER MOTOR CYCLE TYPE MAGNETO. X.2918D- INVESTIGATION OF CONTACT BREAKER MOTION OF DIXIE CONTACT BREAKERS In accordance with Mr. Olley's directions under cover of his memo Cy2/B8617, we have carried out the experiments on the Dixie magneto (as above) referred to under section (5) of those directions. (We are now arranging to carry out experiments under section (6).) X.2918D For investigation of the motion of the Dixie contact breaker at high speeds the Dixie magneto and a Bosch Z.R.6 magneto, for supplying the illuminating spark, were driven as in the accompanying sketch:- [DIAGRAM TEXT] MOTOR PULLEY drives wheel A at 1500 RPM via a BELT. Wheel A drives wheel B at 3000 RPM via a CHAIN. Wheel B drives wheel E at 6000 RPM via 2:1 gears D, E.{Mr Elliott - Chief Engineer} Wheel B also drives wheel C at 3000 RPM. An R.R. electrical speed indicator was arranged to rotate with wheel A, and the Dixie magneto was driven off wheel B through the 2 : 1 gears, D, E.{Mr Elliott - Chief Engineer} The wheel C represents the driving wheel of the Bosch Z.R.6 magneto. It will be seen that when the Weston instrument connected to the R.R. speed indicator read 1500 R.P.M. the Bosch magneto was running at 3000 R.P.M. and the Dixie at 6000. The spark from one side of the | ||