| 摘要 |
<p>The present invention relates to a method that essentially involves placing a free electric charge support (3) comprising conductors (4, 5) in a plurality of particle flows of a cosmic medium field in the immediate vicinity of a screen. Hence, at least one vertical particle flow (AN) of the cosmic medium field is directed towards the gravity centre of the screen (2), and extends simultaneously through at least one surface, at least one conductor (4 or 5) and at least one surface of the support (3) as small as said surface may be.</p> |
