e based upon a uniformityin the velocity with which a liquid of constant level flowsthrough an orifice. Heron, of Alexandria, composed a treatise(now lost) upon hydraulic clocks, and Philo, of Byzantium,in a recently discovered fragment of his Pneumatics, indi-cates several of the apparatus that… … Xlg. 1.-C0ITSTAITI LEVEI. AFFABATUS. Pig. 1 shows one of these apparatus. Let H T be the ves-sel, in which a constant level is to be obtained at the height,Z, despite the outflow that occurs at T. This vessel is sur-mounted with a reservoir, A C B, containing three aper-tures—one at C, for the…
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