When coffee is to be made by a method in which the grounds are
not left in the water for any length of time, the beans must be ground
very fine, in fact, pulverized, for the flavor must be extracted
quickly. For other purposes, such as when it is to be made in a
percolator, the beans need not be ground quite so fine, and when it is
to be made in an ordinary coffee pot they may be ground very coarse.
23. For use in the home, simple coffee mills that will grind coffee as
coarse or as fine as may be desired are to be had. Fig. 1 shows two of
the common types of home coffee mills.
[Illustration: FIG. 1]
The one shown in (_a_) is fastened to a board so that it can be attached
to the wall. The coffee to be ground is put in the chamber _a_, from
which it is fed to the grinding rolls, and the ground coffee drops into
the chamber _b_. The grinding rolls are adjusted to the desired fineness
by the notched arrangement on the end of the shaft.
The coffee mill shown in (_b_) may be placed on a table top or some
other flat surface, but it operates on the same principle as the other.
The coffee beans are placed in the chamber at the top, and the ground
coffee drops into the drawer _a_ at the bottom.
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