. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. Ground Glass Stopper (3) (a) The flask shall be filled with either of the liquids to a point on the stem be- tween zero and 1 c. c, and 64 grams of sand or other fine non-bituminous highway material of the same temperature as the liquid shall be slowly introduced, taking care that the material does not adhere to the inside of the flask above the liquid and to free the material from air by rolling the flask in an inclined position. After all mate- rial is intro
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. Ground Glass Stopper (3) (a) The flask shall be filled with either of the liquids to a point on the stem be- tween zero and 1 c. c, and 64 grams of sand or other fine non-bituminous highway material of the same temperature as the liquid shall be slowly introduced, taking care that the material does not adhere to the inside of the flask above the liquid and to free the material from air by rolling the flask in an inclined position. After all mate- rial is introduced, the level of the liquid will rise to some division of the graduated neck; the difference between readings is the volume displaced by 64 grams of the ma- terial. The specific gravity shall then be obtained from the formula Weight of material (g) Displaced volume (c. c.) (6) The flask, during the opera- tion, shall be kept immersed in water, in order to avoid variations in the temperature of the liquid in the flask, which shall not exceed ° C. The results of repeated tests should agree with II. JACKSON TEST. (4) The determination shall be made with a Jackson specific-grav- ity apparatus (illustrated in fig. 9), which shall consist of a burette, with graduations reading to in specific gravity, about 23 cm. (9 inches) long and with an inside diameter of about cm. ( inch), which shall be connected with a glass bulb approximately 13 cm. ( inches) long and cm. ( inches) in diameter, the glass bulb being of such size that from a mark on the neck at the top to a mark on the burette just below the bulb, the capacity is exactly 180 c. c. ( liquid ounces); and an Erlenmeyer flask, which shall con- tain a hollow ground-glass stopper having the neck of the same bore as the burette, and shall have a capacity of exactly 200 c. c. ( ounces) up to the graduation on the neck of the stopper. (5) The method is as follows: (1) Dry at not more than 110
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