. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Highly volatile and nonvolatile materials should not be subjected to this test at the same time in the same oven owing to a tendency on the part of the latter to absorb some of the volatile products of the former. 24. FLASH AND BURNING POINT TESTS. The open-cup oil tester consists of a brass oil cup, a, (Fig. 20) of about 100 c. c. capacity. The outer vessel, b, serves as an air jacket. No glass cover is used in the open-cup method. A suitable thermom- eter, c, is suspended from the "wire support, d, directly over
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Highly volatile and nonvolatile materials should not be subjected to this test at the same time in the same oven owing to a tendency on the part of the latter to absorb some of the volatile products of the former. 24. FLASH AND BURNING POINT TESTS. The open-cup oil tester consists of a brass oil cup, a, (Fig. 20) of about 100 c. c. capacity. The outer vessel, b, serves as an air jacket. No glass cover is used in the open-cup method. A suitable thermom- eter, c, is suspended from the "wire support, d, directly over the center of the cup so that its bulb is entirely covered "with oil but does not touch the bottom of the cup. The testing flame is obtained from a jet of gas passed through a piece of glass tubing, and should be about 5 millimeters in length. The test is made by first filling the oil cup with the material under examination to within about 5 m. m. of the top. The Bun- sen flame is then applied in such a manner that the temperature of the material in the cup is raised at the rate of 5° C. per minute. From time to time the testing flame is brought almost in contact with the surface of the oil. A distinct flicker or flash over the entire surface of the oil shows that the flash point is reached and the temperature at this point is taken. It will usually be found that the flash point as determined by the open-cup method is somewhat higher than by the closed-cup method, for the same material. The burning point of the material is ob- tained by continuing the test and noting that temperature at which it ignites and burns. The flame should then be extinguished by means of a metal cover supplied with the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washingto
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