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.
SECTION XIII
DRY KILN SPECIALTIES
KILN CARS AND METHOD OF LOADING
Within recent years, the edge-wise piling of lumber (see [Figs. 40] and [41]), upon kiln cars has met with considerable favor on account of its many advantages over the older method of flat piling. It has been proven that lumber stacked edge-wise dries more uniformly and rapidly, and with practically no warping or twisting of the material, and that it is finally discharged from the dry kiln in a much better and brighter condition. This method of piling also considerably increases the holding and consequent drying capacities of the dry kiln by reason of the increased carrying capacities of the kiln cars, and the shorter period of time required for drying the material.
Fig. 40. Car Loaded with Lumber on its Edges by the Automatic Stacker, to go into the Dry Kiln cross-wise. Equipped with two edge piling kiln trucks.