Iowa Geological Survey, Band 14

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Published for the Iowa Geological Survey, 1904
 

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Seite 616 - The abrasive charge shall consist of 300 pounds of shot made of ordinary machinery cast-iron. This shot shall be of two sizes, as described below, and the shot charge shall be composed of one-fourth (75 pounds) of the larger size and three-fourths (225 pounds) of the smaller size.
Seite 327 - Most kaolins and other high-grade clays consist only of kaolinite, quartz, and feldspar, the kaolinite forming the finest particles of the mass, while the balance is quartz, feldspar, and perhaps some mica. The finest particles are known as the clay substance, which may be looked upon as having the properties of kaolinite, for the latter is present in it in such a large excess.
Seite 106 - Each trial was at once weighed, lettered and marked with a 50 mm. marker. Then all were placed in pans of water-free kerosene, where they were allowed to remain twentyfour hours. Each trial in turn was then measured for its volume in a Seger volumeter. The volumeter consists of a glass jar with a capacity of about four litres, having a broad mouth and closed with a ground glass stopper. Through the center of this stopper is a circular opening, into which fits a glass tube, which has an expanded bulb...
Seite 373 - The horse power of a steam engine is given by the equation , plan = ~ where p = mean effective pressure in pounds per square inch, l = length of stroke in feet, a = area of piston in square inches, n = number of strokes per minute, or twice the number of revolutions per minute.
Seite 107 - The upper end of the burette expands to a bulb that serves as a reservoir for the liquid drawn upward through the burette. To the bent portion of the tube above the bulb is connected rubber tubing of convenient length to use in drawing the liquid into the burette. The glass tube inserted in the stopper of the jar has...
Seite 327 - As each of these three components of the kaolin — clay substance, quartz and feldspar — have characteristic properties, the kaolin will vary in its behavior according as one or the other of these constituents predominates or tends to increase. As to the characters of these three: Quartz is nearly infusible, non-plastic, has very little shrinkage, and is of low tensile strength; feldspar is easily fusible and of low plasticity by itself; kaolinite is plastic and quite refractory, but shrinks considerably...
Seite 616 - The smaller size shall be cubes of 1£ inches on a side, with rounded edges. The individual shot shall be replaced by new ones when they have lost one-tenth of their original weight.
Seite 616 - Other machines may be used having from twelve to sixteen staves, with openings from one-eighth to three-eights of an inch between staves, but if this is done a record of it must be attached to the official report of the test.
Seite 616 - The staves .shall preferably be composed of steel plates, as cast-iron peens and ultimately breaks under the wearing action on the inside. There shall be a space of one-fourth of an inch between the staves for the escape of the dust and small pieces of waste.
Seite 327 - The above conditions will be affected by a reducing atmosphere in burning, or the presence of sulphur in the fire gases. 4. The quantity of water. Clays with a large amount of chemically combined water sometimes exhibit a tendency to crack in burning, and may also show high shrinkage.

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