Fenner's Complete Formulary - Southwest School of Botanical ...

do the work of a press.
FILTRATION.
The process of separating insoluble matter from liquids, by means of
any substance or medium which will prevent its passage, is called
filtration.
Filtration, as it is employed in pharmacy, is usually conducted by means
of filtering paper contained in a conical receptacle called a funnel;* but
larger operations are carried on by other contrivances which will admit
of a more rapid filtration.
The process of filtration is so familiar that it needs no explanation; but a
few suggestions are here made for the benefit of the inexperienced.
*FENNER'S SPIRAL FILTER RACK is a convenience for keeping the filtering paper
off the sides of the funnel when filtering. It is
made of tinned steel wire, of different sizes to fit
different size funnels.
It is simple, cleanly, durable, efficient and
cheap. The cut shows it as it is adjusted in the
funnel ready for use.
Heat often assists the process of filtering
heavy liquids or oils. It may be conveniently
applied by putting a filter inside of Fenner's
water-bath percolator, and applying heat by
means of the water-bath. For supporting the
funnel during filtration, Fenner's Funnel Rack,
which is shown in the cut, is very convenient.
Further remarks on filtering will be found in
the article on " Economy in Percolating and Filtering," page 43.
Fenner’s Complete Formulary - Part I-II - MISCELLANEOUS FORMULA - Page 33
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