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).
Procedure outlining a series of electrical and endurance tests for a magneto.
| Identifier | ExFiles\Box 4\5\ 05-page106 | |
| Date | 18th November 1920 guessed | |
| -2- Contd. (8) The open circuit wolt-speed curve of the primary winding shall now be obtained, making use of a suitable A.C. instrument. (9) The closed circuit primary ampere-speed curve shall now be obtained, making use of a moving iron A.C. instrument reading up to about 5 amperes. (10) The magneto shall now be subjected to a short circuit test in which it is run at 1500 R.P.M. for half a minute with the timing lever central, and secondary winding short circuited, i.e. with the high tension terminal connected to earth. (11) The magneto shall now be subjected to an open circuit test in which the machine is again run at 1500 R.P.M. for half a minute with the timing lever central, and with the high tension terminal not connected to anything, so that the secondary discharge takes place on the safety gap of the magneto. (12) The magneto shall now be run for 15 minutes at 1500 R.P.M. with the distributor in action, timing lever central, and the discharges taking place on a series of spark gaps set at 5.0 mm. in air. Lengths of H.T. leads to be two feet. Contd. | ||