Bulletin Volume 3; No. 5 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...start the stop watch. Stir the liquid in the bath during the run and carefully maintain it at the previously determined proper temperature. Stop the watch when the bottom of the meniscus of the oil reaches the mark on the neck of the receiving flask. The time in seconds for the delivery of 60 c. c. of oil is the Saybolt viscosity of the oil at the temperature at which the test was made. POUR TEST A. S. T. M. METHOD D47-18. The pour test indicates the temperature at which a sample of oil in a cylindrical container of specified diameter and length will just flow under specified conditions. APPARATUS. The apparatus for the pour test consists of the following: (a) Glass jar, approximately inches inside diameter and 4 to 5 inches high, provided with a tightly fitting cork, (b) Mercury thermometer, fitted securely in the cork so that the shaft will be held centrally in the jar with the tip of the bulb one-half inch from the bottom. The thermometer made for this test has a bulb one-fourth to threeeighths inch long, (c) Metal jacket, closely fitted around the glass jar and provided at the bottom with a disk of cork felt about onefourth inch thick. METHOD OP TESTING. Place the oil in the jar to a depth of about 1 inches, or a sufficient depth to reach one-fourth inch above the bulb of the thermometer; fit the cork tightly into the jar and place the jar in the metal jacket; then place the jacket in a freezing mixture. At each drop in temperature of 5 F. (on the readings which are multiples of 5) remove the jar from the jacket and tilt it just enough to make the oil flow. The pour test of the oil shall be taken as 5 higher than the reading of the thermometer when the oil has cooled so that it will not flow when the jar is tipped to a horizontal position. The rat...