. The book of the garden. Gardening. they can be so built as to carry carts or carriages, by laying from each abut- ment three 6-inch Baltic battens, set on edge across, and tied together at the ends and middle with an iron bar, to keep them in their places. Over this a flooring of deal or oak is laid, rough from the saw, the upper surface of which is to be covered with a coat of asphalt, to form the footway, and to keep the flooring dry. The outer sides of the two outer battens are covered with larch bark, and the parapets or hand-rails are constructed of pieces of the same kind of tree, cut
. The book of the garden. Gardening. they can be so built as to carry carts or carriages, by laying from each abut- ment three 6-inch Baltic battens, set on edge across, and tied together at the ends and middle with an iron bar, to keep them in their places. Over this a flooring of deal or oak is laid, rough from the saw, the upper surface of which is to be covered with a coat of asphalt, to form the footway, and to keep the flooring dry. The outer sides of the two outer battens are covered with larch bark, and the parapets or hand-rails are constructed of pieces of the same kind of tree, cut into the necessary lengths, and selected so as to be of as near the same thickness as possible. The middle of the footway should be rather higher than the sides, to allow of the escape of rain water, which can easily be done, by laying on the asphalt rather thicker in the middle than at the sides. If the span be great, or the contem- plated weights to which it may be sub- jected considerable, struts may be placed in the abutments; and if partially curv- ed, as shown in the figure, the effect will be improved, and considerable strength added to the bridge, by shortening the length, as it were, of the principal beams. Fig. 954 is somewhat differently con- structed. A slight curvature is given to Fig. the principal bearers * and instead of their being covered with boarding, they are 4 R. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McIntosh, Charles, 1794-1864. Edinburgh and London, W. Blackwood
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
