| 摘要 |
A multi-layer filter of cotton, plastic mesh and burlap with top and bottom metal mesh is sandwiched between two sections of wooden frame and mounted on a wind chamber. An even non-deflected steady stream of air under the filter produces an electro dynamic charge in the filter to attract fine particles of gold, silver, platinum, or mercury to the filter from a steady stream of earth material, containing fine particles, flowing over the downwardly angled filter.
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