Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 82
ssible to get in more than two horizontal planks be- cause of the softness of the breast. In that case the sand at lower edge of the last plank was leveled and a row of shingle was placed against it and forced into the sand. A shingle being 16 in. long, the bottom could be held by the sand and the… … would be found more Fig. satisfactory. As it was unsafe to rely upon the bars for the support of the roof for any length'of time, a long center x-*rop was then in- serted under the middle -of the cap. It will be seen that it was necessary to put the foundation of this center prop as low as…
Engineering
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