_Details of Structure_.--The filter, which is shown in detail in Figs.
5 to 7, is formed of two semicylindrical cast iron shells, F, that are
firmly united, and held by a strong iron band which is cleft at one
point in its circumference, and to which there is adapted a mechanism
permitting of loosening it slightly so as to facilitate the escape of
the oil-cake. Within these shells, F, there are grooves, a, which have
the arrangement shown by the partial section in Fig. 11, and through
which flows the oil expressed by pressure. To prevent the escape of the
material through these grooves or channels, the interior of the shells
is lined throughout with plates or strips of brass that fit very closely
together, and present a simple slit with chamfered edges opposite the
grooves. At the two joints of the shells four of these plates are
riveted two by two; all the others are movable, and rest, like the
pieces of an arch, against the fixed plates that form abutments. Each
half lining is thus held by means of a central plate, b' (Fig. 10), with
oblique edges, and which, being driven home by the top of the filter,
binds the whole tightly together. All these plates, which are slightly
notched at their upper part, rest on a small flange at the lower part of
the shells.
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