. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN" 314, U. S. DEPARTMENT OF AGRICULTURE. thermometer 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 rilling the oil cup with the material under examination to within about 5 millimeters of the top. The Buns en flame is then applied in su
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN" 314, U. S. DEPARTMENT OF AGRICULTURE. thermometer 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 rilling the oil cup with the material under examination to within about 5 millimeters of the top. The Buns en 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 dis- tinct 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 some- what 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 in- strument. USE OF FLASH-POINT AND BURNING-POINT DETERMINATIONS. The flash and burning point deter- minations should be made on all bi- tuminous road materials which have to be heated before application and upon all fluid and semisolid products. 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. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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