. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. s, which at that time have risento the surface but sink again as soon as fertil-ized. The hydrophytes show many examplesof exceedingly wide distribution, as might beexpected of oceanic plants, but is not so easilyexplained of those of fresh waters, many generaand species of which, nevertheless, are cosmo-politan. Hydrostatic Press, a machine, sometimescalled Bramahs press, from Joseph Bramah,its presumed inventor, which by the force ob-taine
. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. s, which at that time have risento the surface but sink again as soon as fertil-ized. The hydrophytes show many examplesof exceedingly wide distribution, as might beexpected of oceanic plants, but is not so easilyexplained of those of fresh waters, many generaand species of which, nevertheless, are cosmo-politan. Hydrostatic Press, a machine, sometimescalled Bramahs press, from Joseph Bramah,its presumed inventor, which by the force ob-tained from water under pressure performswork, especially packing, as of cotton. Twotubes of unequal area are connected, and thewhole vessel filled with water. Let the area ofthe smaller tube be one square inch, and let thepiston that closes it be loaded with one pressure of one pound per square inch willbe exerted on every part of the boundary of thefluid. There will thus be a pressure of onepound per squareinch put upon thepiston that closes thelarger tube; and ifwe suppose the areaof the piston to be 16square inches, it isevident that it must. Principle of the Hydraulic Press. Cup-leather. be loaded with 16 pounds in order that the pres-sure to which it is exposed may be a load of one pound on the smaller pistonsupports 16 pounds on the larger. The principle of the hydrostatic press waspointed out by Stevinus; but it was Bramahwho, in 1796, by an ingenious contrivance, gavethe principle practical application. A Bramahspress, as ordinarily constructed and used to pro-vide immense pressure, is a simple enough con-trivance. By means of a small pump water ispumped from a cistern through a small horizon-tal tube into the space that receives a large pis-ton. The goods to which pressure is to be ap-plied are placed between the plate attached tothe large piston and an upper plate that is keptin position by powerful iron rods. The water-tight stuffing of the pist
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Keywords: ., bookcentury1900, bookdecade1900, bookidamericanauni, bookyear1903
