anged for that purpose thereby creating considerable saving
in the handling of the material to be dried into the kiln. The entire
arrangement thus secures the maximum capacity, with a minimum amount
of floor space, with the least expense. Of course, the higher these
kilns are built, the less relative cost for a given result in the
amount of material dried.

In some instances, these kilns are built less in height and up against
an embankment so that teamloads of material may be run directly onto
the roof of the kilns, and dumped through the hoppers into the drying
rooms or bins, thus again reducing to a minimum the cost of this
handling.

The return air duct plays an important part in both of these methods
of filling, permitting the air to become saturated to the maximum
desired, and utilizing much of the heat contained therein, which would
otherwise escape to the atmosphere.

The "Tower" kiln is especially adapted to factories of the following
class:

Sawmills;
Novelty factories;
Woodenware factories;
Tub and pail factories; etc.

The "Box" Dry Kiln

The "Box" kiln shown in Figure 39 is an exterior view of a kiln of
this type which is 20 feet wide, 19 feet deep, and 14 feet high, which
is the size generally used when the space will permit.

Box kilns are used mostly where only a small quantity of material is
to be dried. They are not equipped with trucks or cars, the material
to be dried being piled upon a raised platform inside the drying
room. This arrangement, therefore, makes them of less cost than the
other types of dry kilns.

They are particularly adapted to any and all species and size of
lumber to be dried in very small quantities.

[Illustration: Fig. 39. Exterior view of the Box Dry Kiln.
This particular kiln is 20 feet wide, 19 feet deep and 14
feet high. Box kilns are used mostly where only a small
amount of kiln-dried lumber of various sizes is required.
They are not equipped with trucks or cars, and therefore cost
less to construct than any other type of dry kiln.]

In these small kilns the circulation is under perfect control, so that
the efficiency is equal to that of the more extensive plants.

These special kilns will readily appeal to manufacturers, whose output
calls for the prompt and constant seasoning of a large variety of
small stock, rather than a large volume material of uniform size and
grade.