Oils and Varnishes

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James Cameron
J. & A. Churchill, 1886 - Oils and fats - 376 pages
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Page 278 - The test lamp is then placed in position upon the lid of the cup, the lead line or pendulum, which has been fixed in a convenient position in front of the operator, is set in motion, and the rise of the thermometer in the petroleum cup is watched.
Page 278 - ... slowly until the level of the liquid just reaches the point of the gauge which is fixed in the cup. In warm weather the temperature of the room in which the samples to be tested have been kept should be observed in the first instance, and if it exceeds 65...
Page 275 - Ц" below the centre of the lid. The cover is provided with three square holes, one in the centre, та" hy A"i ачЛ *™ smaller ones, J^" by -fa", close to the sides and opposite each other. These three holes may be closed and uncovered by means of a slide moving in grooves, and having perforations corresponding to those on the lid. In moving the slide so as to uncover the holes, the oscillating lamp is caught by a pin fixed in the slide, and tilted in such a way as to brin" the end of the...
Page 276 - Two thermometers are provided with the apparatus, the one for ascertaining the temperature of the bath, the other for determining the flashing point. The thermometer for ascertaining the temperature of the water has a long bulb and a space at the top. Its range is from about 90 to 190 Fahrenheit.
Page 279 - ... being applied once for every rise of one degree, in the following manner : — The slide is slowly drawn open while the pendulum performs three oscillations, and is closed during the fourth oscillation. NOTE.
Page 275 - The top of the bath projects both outwards and inwards about • ; that is, its diameter is about " greater than that of the body of the bath, while the diameter of the circular opening in the centre is about the same amount less than that of the inner copper cylinder. To the inner projection of the top is fastened, by six small screws, a flat ring of ebonite, the screws being sunk below the surface of the ebonite, to avoid metallic contact between the bath and the oil cup. The exact distance...
Page 274 - ... in diameter. The socket which is to hold the thermometer is fixed at such an angle and its length is so adjusted that the bulb of the thermometer when inserted to its full depth shall be 1|
Page 277 - ... 2. The heating vessel or water bath is filled by pouring water into the funnel until it begins to flow out at the spout of the vessel. The temperature of the water at the commencement of the test is to be 130...
Page 279 - The air chamber that surrounds the cup is filled with cold water to a depth of 1^ inches, and the heating vessel, or water bath, is filled as usual, but also with cold water. The lamp is then placed under the apparatus and kept there during the entire operation. If a heavy oil is being dealt with, the operation may be commenced with water previously heated to 120 F., instead of with cold water.
Page 257 - The presence of alcohol may be detected by agitating the oil with a few small pieces of dried chloride of calcium. These remain unaltered in a pure essential oil, but dissolve in one containing alcohol, and the resulting solution separates, forming a distinct stratum at the bottom of the vessel. When only a very little alcohol is present the pieces merely change their form, and exhibit the action of the solvent on their angles or edges, which become more or less obtuse or rounded.

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