ce air that permeable, but if a persistent rain removes such salts, centimeters of water. in a spray becomes more and remains for a short time in a closed vessel in contact with the clay allows itself to be carried along, the inter- more impermeable in measure as the spraying is more the earth very… … $368,175; baryta, $168; chromite, $41,301; coal, $7,774,- APPARATUS FOR THE STUDY OF THE PERMEABILITY traversed at every instant by a quantity of air equal OF THE EARTH. |178; coke, $148,947; fire clay, $3,492; graphite, $6.150; to that removed from it by the tromp, the pressure in |grindstonés,…
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