. A treatise on pharmacy .. . he tube of the fun-nel; this will obviate one of themost common annoyances con-nectd with filtration. In filtering into an open vessel,it is well to place the lower ex-tremity of the funnel in contactwith the side of the vessel, thuspreventing any inconveniencefrom the liquid splashing on thesides or over the top, and by cre-ating a downward stream, pro-moting the free and rapid passage,of the paper of which the filter is formed, especially if very porous, isliable to be weakened by being plaited as above described; it is there-fore advised not to mak
. A treatise on pharmacy .. . he tube of the fun-nel; this will obviate one of themost common annoyances con-nectd with filtration. In filtering into an open vessel,it is well to place the lower ex-tremity of the funnel in contactwith the side of the vessel, thuspreventing any inconveniencefrom the liquid splashing on thesides or over the top, and by cre-ating a downward stream, pro-moting the free and rapid passage,of the paper of which the filter is formed, especially if very porous, isliable to be weakened by being plaited as above described; it is there-fore advised not to make the creases firmly down to the very point, butrather to leave the terminus of an undefined shape; and when thereis danger of breakage, either from the great weight of the liquid orfrom the weakness of the paper at its point, a very small plain filtermay be advantageously placed under the point at the lowest extremityof the funnel; this is called a cap, and acts as a support to the weakestand most exposed part of the Fig. 110. Fig. ill.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectpharmacy, bookyear186
