HYDROSTATICS.

177

ses, is a given quantity, and nearly = .053, inparts of a square inch.

It follows also from the above, that the weights of thecolumns of water sustained in capillary tubes, areas the diameters of these tubes.

Though the rise of water above its natural level ismost manifest in small tubes, it appears, in a de-gree, in all vessels whatsoever, by a ring of waterformed round the sides, with a concavity upwards.

267 . Capillary suspension takes place, thoughthe tube be not immersed in water, providing adrop of water adhere to the lower end of it.

268. The surface of the water in a capillarytube is concave upwards; and if by taking thetube out of the water, and inclining it, the fluidbe made to move along it, the concavity appears atboth ends of the column, and is the same in figureand size whether the tube be held perpendicular-ly, horizontally, or obliquely.

269. When by inclining the tube, the columnof water is made to move, it appears to suffer re-sistance as it approaches either end, and does notcompletely reach the end, till the tube is either al-together, or very nearly, inverted.

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