. Bulletin of the Department of Agriculture. Agriculture; Agriculture. EXAMINATION" OF BITUMINOUS -ROAD MATEKIALS. 33 cover b. A copper jacket c, 4| centimeters in diameter at the top and 21 centimeters long, is held in the neck of the bell jar by means of a rubber stopper d, and fits into the upper portion of the rubber stopper j. A glass filter tube e fits inside the copper jacket, and to prevent circulation of air and condensation of water between it and the jacket, a strip of heavy blotting paper/is wrapped around the top of the filter tube. Just below the constriction in the fil
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. EXAMINATION" OF BITUMINOUS -ROAD MATEKIALS. 33 cover b. A copper jacket c, 4| centimeters in diameter at the top and 21 centimeters long, is held in the neck of the bell jar by means of a rubber stopper d, and fits into the upper portion of the rubber stopper j. A glass filter tube e fits inside the copper jacket, and to prevent circulation of air and condensation of water between it and the jacket, a strip of heavy blotting paper/is wrapped around the top of the filter tube. Just below the constriction in the filter tube a wad of absorbent cotton g is placed, tightly compressed to a length of 2 centimeters by means of a glass rod. Above this is a wad of tightly packed asbestos wool Ji, about 5 millimeters in length, upon which an asbestos filtering mat i is prepared. The filter tube passes through a rub- ber stopper j into a vacuum filtering flask Jc of 500 cubic centi- meters capacity. The rubber stopper j is placed as tightly as possible against the neck of the bell jar, but to insure that there is no circula- tion of air, a disk of blotting paper I is compressed between them. The thermom- eter m is capable of recording tempera- tures from —25° C. to 0° C. and has the — 20° C. graduation at least 14 centimeters from the bulb. It is supported by means of a guiding cork n and cork disk o, which is held tightly against the top of the filter tube by the clamp p. The bell jar is filled with a freezing mixture of ice and salt in the proportion of three to one, which as it melts is drawn off through the bent glass tube <[, which is fitted with a rubber connection r and pinchcock .s and collected in the 500 cubic centimeter filtering i'L k t. The apparatus is supported on the ring u and condenser clamp v, ;ii tached to the stand vj. In separating the paraffin scale the following procedure is earned out. The filtering flask k is removed and a small cork stopper rted in. the lower cu
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