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).
Page of test procedures for ignition system components including circuits, contact breakers, and magnetos.
| Identifier | ExFiles\Box 70\4\ scan0126 | |
| Date | 22th January 1925 guessed | |
| -2- Contd. (3) Continuity of primary and secondary circuits shall be tested by applying an A.C. voltage of 205 between the high tension terminal and the frame, with the contact points held apart, when a small 4 volt lamp connected between the low tension terminal and the frame should be lighted. (4) The contact breaker cover shall be replaced, and a test shall be made of the tangential force at lever pin radius necessary to cause advance or retard. In various positions this shall everywhere lie between the limits 3 lbs. and 5 lbs. To secure this, if necessary, an adjustment of the cover springs should be effected. (5) The machine, with the control lever in the central position, shall now receive a preliminary run at 1500 r.p.m. for half a minute with the secondary winding short circuited, and then following this a second run of half a minute with the H.T. discharge taking place on the safety spark gap. (6) Now replace the distributor ring and end plate and connect up the H.T. terminals to six spark gaps in sequence, set at 5.5 mm. The magneto with the control lever central shall be run at 1500 r.p.m. for a period of 15 minutes, followed by a second run, now with the control lever fully advanced, at 3000 r.p.m. for a period of 15 minutes. During both these periods no appreciable missing shall occur on the 5.5 mm. gaps in air. It should be further observed during the tests that the meshing of the distributor Contd. | ||