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).
Testing procedures for magneto sparking regularity and firing speeds at different advance positions.
| Identifier | ExFiles\Box 4\5\ 05-page301 | |
| Date | 2nd September 1924 guessed | |
| -4- Contd. Note. It will generally be found that the capacity of regular sparking depends to some extent on the polarity of the spark. Therefore in the above it is to be understood that the one of the six test gaps which is replaced by the annular gap with shunted leak is the one of that polarity which is the less easy to spark regularly. (12) The highest speed at which the magneto is capable of firing regularly in sequence the six 5.5 mm. third point spark gaps in air, in the fully advanced position, shall now be obtained. (13) Now obtain the lowest speeds at which the magneto is capable of firing regularly in sequence six 5.5 mm. third point spark gaps in air in each of three positions for magnetos with no automatic advance:- (a) Fully advanced position. (b) Central position. (c) Fully retarded position. and in each of two positions for magnetos fitted with automatic advance :- (b) Fully advanced position (hand range only). (c) Fully retarded Note:- The minimum regular sparking speed can be taken to be that speed at which 100 consecutive sparks, without missing, are given by the magneto at some time within a period not greater than 5 minutes. (14) The maximum and minimum milliamperes taken by the secondary winding at 108 volts A.C. 50~ shall now be observed. Contd. | ||