2.
[Illustration: FIG. 3]
28. PERCOLATORS are very desirable for the making of coffee, for they
produce excellent results and at the same time make the preparation of
coffee easy. Those having an electric attachment are especially
convenient. One form of percolator is shown in Fig. 3. In this
percolator, the ground coffee is put in the filter cup _a_ and the water
in the lower part of the pot _b_. The water immediately passes into the
chamber _c_, as shown by the arrows. In this chamber, which is small, it
heats rapidly and then rises through the vertical tube _d_. At the top
_e_, it comes out in the form of a spray, strikes the glass top, and
falls back on a perforated metal plate _f_, called the spreader. It then
passes through this plate into the filter cup containing the grounds,
through which it percolates and drops into the main chamber. The
circulation of the water continues as long as sufficient heat is
applied, and the rate of circulation depends on the degree of heat.
29. The DRIP POT, or _coffee biggin_, as it is sometimes called, one
type of which is shown in Fig. 4, is sometimes preferred for the making
of coffee.
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