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Scag i mbreogán Gooch ina bhfuil leaba scagacháin trí-shrathach -aispeist gharbh an chéad cheann, scagpháipéar atá ina laíon an dara ceann, agus aispeist mhín an tríú ceann.
Filter through a Gooch crucible containing a three-layer filter bed — the first, coarse asbestos; the second, filter paper reduced to a pulp; and the third, fine asbestos.