Fig. 8. Home-made drier of galvanized iron, for use on stove.
In a Drier of the dimensions given there is room for
eight trays. The sides, top and back are of galvanized iron or tin sheets,
tacked to the framework, although thin strips of wood may be used instead of
the metal. Small hinges and thumb-latch are provided for the door.
Galvanized sheet iron, with numerous small holes in it, is used for making
the bottom of the Drier. To prevent direct heat from coming in contact with
the product, and also to distribute the heat by radiation, a piece of
galvanized sheet iron is placed 2 inches above the bottom. This piece is 3
inches shorter and 3 inches narrower than the bottom and rests on two wires
fastened to the sides.
Fig. 9 Home-made drier with swinging crane.
The trays are made of wooden frames of 1-inch strips, to
which is tacked galvanized wire screen. Each tray should b 3 inches shorter
than the Drier and enough narrower to allow it to slide easily on the
supports in being put in or taken out.
In placing the trays
in the Drier push the lower one back as far as it will go, leaving a 3-inch
space in front. Place the next tray even with the front, leaving the space
at the back. Alternate all the trays in this way, to facilitate the
circulation of the heated air. It is well to have a ventilating opening, 6
by 2 inches, in the top of the Drier to discharge moisture. The trays should
be shifted during the drying process, to procure uniformity of drying.
One of the simplest forms of homemade Drier is a tray with bottom
of galvanized wire screen, suspended over stove or range, as shown in
Fig. 10. Commercial drier.
Driers are in the market in several types. One of these, shown in
has a series of trays in a framework, forming a compartment. This is placed
on top of the stove. A similar drier is shown in
Fig. 7, has a series of
trays in a framework, forming a compartment. This is placed on top of the
stove. A similar drier is shown in Fig. 10. Another, shown in Fig. 6, is a
shallow metal box to be filled with water, and so constructed that one end
may rest on the back of the stove and the other on a prop reaching to the
floor, or it may be suspended over a lamp.
Commercial Driers having their own furnaces may be bought at prices
ranging from $24 to $120. This type is pictured in
Fig. 11. Some of these,
in the smaller sizes, may be bought without furnaces, and used on the top of
the kitchen stove, as Fig. 7. The cost is from $16 upwards.