. Elements of technology :. The mediationof a portion of air, is employed for raising water, not only inthe spiral pump, but also in the air vessels of Schemnitz, in themanner shown in Fig. 16. A column of water, Fig, ig,descending through a pipe C, into a closed re-servoir, B, containing air, obliges the air to act,by means of a pipe D, leading from the upperpart of the reservoir or air vessel, on the waterin a second reservoir. A, at any distance eitherbelow or above it, and forces this water to as-cend through a third pipe, E, to any heightless than that of the first column. The airvessel i
. Elements of technology :. The mediationof a portion of air, is employed for raising water, not only inthe spiral pump, but also in the air vessels of Schemnitz, in themanner shown in Fig. 16. A column of water, Fig, ig,descending through a pipe C, into a closed re-servoir, B, containing air, obliges the air to act,by means of a pipe D, leading from the upperpart of the reservoir or air vessel, on the waterin a second reservoir. A, at any distance eitherbelow or above it, and forces this water to as-cend through a third pipe, E, to any heightless than that of the first column. The airvessel is then emptied, the second reservoirfilled, and the whole operation repeated. Theair mtist, however, acquire a density, equivalentto the pressure, before it can begin to act; sothat if the height of the columns were 34 feet, it must be re-duced to half its dimensions before any water would be raised ;and thus half of the force would be lost. But where theheight is small, the force lost in this manner is not greater than41. 322 AKTS OP CONVEYING WATER. that which is usually spent in overcoming friction, and otherimperfections of the machinery employed ; for the quantity ofwater, actually raised by any machine, is not often greater thanhalf the power which is consumed. The force of the tide, orof a river rising and falling with the tide, might easily be ap-plied by a machine of this kind, to the purpose of raising if at low tide the vessel A was filled with air, then athigh tide the water flowing down the tube E, would cause thewater in the vessel B to ascend in the pipe C. Heroes Fountain.âThe fountain of Hero, precisely resem-bles in its operation, the hydraulic vessels of Schemnitz, whichwere probably suggested to their inventor by the constructionof this fountain. It may be used simply to raise water, or toproject it upwards in the form of a jet, as in Fig. Fig-. The first reservoir C of the fountain islower than the orifice of the jet. A pipe de-scends fro
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