Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 52 liquid, and hence, to fiijd the total pressure on the side of a vessel, we have Totel lateral p. ^ Area of sides x depth x What is the total pressure on the bottom and on the sides of a reservoir 6 x 6 x G feet filled with water at ° at 80° What is the lateral pressure on the lower six inches of a cvlindrical tank ten feet in diameter filled with water to a depth of ten feet? If this pressure is to be sustained by an iron hoop composed of one-eighth inch b
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 52 liquid, and hence, to fiijd the total pressure on the side of a vessel, we have Totel lateral p. ^ Area of sides x depth x What is the total pressure on the bottom and on the sides of a reservoir 6 x 6 x G feet filled with water at ° at 80° What is the lateral pressure on the lower six inches of a cvlindrical tank ten feet in diameter filled with water to a depth of ten feet? If this pressure is to be sustained by an iron hoop composed of one-eighth inch band iron, how wide should the hoop be? 91. Pressure of Grain in Bins.— The downward pres- sure of grain in bins follows the same law as that of liquids, but the lateral pressure is always less on account of the fric- tion between the kernels. When grain is heaped up on a level surface it is found impossible to pile beyond a certain hight Avithout increasing the diameter of the pile at the base. A certain angle of slope is maintained, which for wheat is about 31°, about 30° for shelled corn, and for oats about 34°. The friction of the kernels upon one another is just great enough to maintain this angle, but in filling a bin with wheat, for example, introducing it at the center, after a certain quan- tity has been added the base of the cone is extended until it reaches the sides of the bin, and the addition of any further quantity brings into existence an outward pressure on the walls of the bin tending to spread them. The case is analogous to the retaining walls which are often built to prevent sand or earth from caving or sliding. The amount of this pressure and the method of computing it will be understood from Fie:. 24. Fig. U.
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