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Seite 47 - ... ascertain what power it exercises to resist the pressure of water. The pressure of water upon any plane surface immersed is known to be equal to the area of that surface, multiplied by the depth of its centre of gravity below the level of the water and by the weight of a unit of water. Generally speaking, the unit adopted in calculations is a foot; and the unit of water being taken at a cubic foot, weighing 62.5 Ibs., the resulting product from the multiplication of the three quantities will...