Outlines of Natural Philosophy: Being the Heads of a Course of Lectures ... 1-2
Outlines of Natural Philosophy: Being the Heads of a Course of Lectures ... 1-2
James Renwick
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II. chap. 7* Mechanics. 131 ' From them it appears, that where water is to be admitted from a reser- voir into a pipe, through which it is to discharge itself, the part of the jpipe adjacent to the reservoir should be made of the form of the vena contracta ; while the opposite extremity of the pipe should be ako conical, its sides diverge from the axis at angles of 16^. 286. When a prismatic, or cylindrical vessel, is permitted to empty itself through an orifice ; if the quantity that would be ...discharged in a given time be calculated upon the hypothesis in section 276, and reduced in the proportion of 5 to 8 ; it will afford results that will be accurate, until the fluid shall have de- scended nearly to the bottom ; at this time a funnel shaped cavity is formed at the surface, and a whirling motion takes place, that renders the discrepancy still greater ; for this no adequate correction has yet been found. Bossut, ^ 433, On this account, in the clepsydra, no dependence can be placed on the regularity of the discharge of the last portion of fluid.
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