. Bulletin. Forests and forestry -- United States. Sills. Sc*L£g Inch=1 Foot Fii,. 6.—Showing construction with lour vertical legs. Next, use three-quarter-inch iron dowel pins to connect columns to caps and sills, and further use diagonal braces bolted through with three-quarter-inch bolts and large 2-inch washers, so that the trestle bent will be a compact, rigid structure which, if necessary, can be lifted with a hoist and set up in place. I inclose another sketch, showing two vertical legs and two slanting, outside legs, using dowel pins, wooden splice pieces, and bolts for con- necting th
. Bulletin. Forests and forestry -- United States. Sills. Sc*L£g Inch=1 Foot Fii,. 6.—Showing construction with lour vertical legs. Next, use three-quarter-inch iron dowel pins to connect columns to caps and sills, and further use diagonal braces bolted through with three-quarter-inch bolts and large 2-inch washers, so that the trestle bent will be a compact, rigid structure which, if necessary, can be lifted with a hoist and set up in place. I inclose another sketch, showing two vertical legs and two slanting, outside legs, using dowel pins, wooden splice pieces, and bolts for con- necting the whole in the one rigid frame (fig. 7). By using dowel pins the bearing of post on caps and sills is not impaired. The posts can be proportioned without making additions for mortises. The work of fitting is very much reduced. The larger amount of ironwork in the form of bolts and washers is not a disad- vantage, since these can be used again in the renewal of the structure. The detail of corbel bearings, as provided in Mr. Johnson's design, is to be commended; but I would not commend using short stringers the length of only one panel. The stringers should always be the length. 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 United States. Division of Forestry. Washington : G. P. O.
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