. The new hydropathic cook-book : with recipes for cooking on hygienic principles : containing also a philosophical exposition of the relations of food to health : the chemical elements and proximate constitution of alimentary principles : the nutritive properties of all kinds of aliments : the relative value of vegetable and animal substances : the selection and preservation of dietetic materials, etc., Elements of i?oo n 31 Ascending Filter—Cistern and Double Cistern ASCKNPINM I Nature, the water is more perfectly filtered by an ascendingmotion, hi descending, some
. The new hydropathic cook-book : with recipes for cooking on hygienic principles : containing also a philosophical exposition of the relations of food to health : the chemical elements and proximate constitution of alimentary principles : the nutritive properties of all kinds of aliments : the relative value of vegetable and animal substances : the selection and preservation of dietetic materials, etc., Elements of i?oo n 31 Ascending Filter—Cistern and Double Cistern ASCKNPINM I Nature, the water is more perfectly filtered by an ascendingmotion, hi descending, some of the impurities might be forcedthrough the sand by their own gravity ; but in ascending, theforce of gravitation opposes theii farther progress. Fig. 2 is avery simple contrivance il- Fig. 2. lustrative of this can easily availthemselves of this plan ; «,b, c represent a curved tube,round or square, filled withsand or charcoal, or both, upto the level, c. A small flan-nel bag is put in the end ofthe tube at a. The coarsestimpurities are retained by the flannel, the liner by the sand;and in passing upward to b, the purification is rendered com-plete. It should be noticed, that the more compact the sandand the stones the wafer passes, the more perfect will be theprocess of purification. Cisterns are often constructed in cellars, and divided by apartition, reaching nearly to the bot-tom, into two unequal parts (fig. 3).The largest division, i, is half
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Keywords: ., bookcentury1800, booksubjectfood, booksubjectnutritionalphysiolo
