By George Bommer
Article Third.—Grate upon which the Heap is built.
To construct the grate, take laths of from three to five inches wide, and half to one inch thick, place them at from one to one and a half inches distance from each other, upon wooden support, one inch thick and six inches high in the high part, and nine inches high in the lower part, or toward the reservoir, so that when the grate is set upon the excavation it will be upon a level with the exterior soil.
The laths ought to be as long as the width of the excavation, and the supports as long as the length of it, because the grate covers all the surface of the excavation. The number of laths will depend upon the length of the excavation, and that of the support upon the breath.
These last should be placed at two feet distance from each other, to commence at the interior edge of the excavation on each side. In this manner the grate will have sufficient strength to support all the weight of the heap.
Before nailing the laths upon the supports, three openings should be made in nu ll support, whore they do not rest upon the excavated ground; that is to say, you should make in each support three vent-holes with the saw, half the height i of tho support and one foot wide.
These vent-holes should be made in the intervals of the large laths which are inlaid in and traverse the excavation, so that in all cases the wood of the supports may rest upon the laths.
These vent-holes are intended to facilitate the circulation of the air under the grate, and of course under the heap.
The advantages o this grate are described in the second part of this Method Article 2, Section 2.
Below in the plan of the grate:—
This grate has the same dimensions as the excavation in fig. 1.— Its construction is sufficiently explained in
Here is the original 1845 page:
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