. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 47. oblique pieces to the horizontal position, so that a framing, like. ? Fig. 48. Figure 47, or an arch, like Figure 48, will exert a greater thrust than either Figure 44 or Figure 46, when loaded with the same weight. The distance, A B, is termed the rise of the arch, C D, the span, and upon their relative values the thrust of the arch will depend. In a semi-circular arch, Figure 49, no thrust is exerted at its very lowest points, A
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 47. oblique pieces to the horizontal position, so that a framing, like. ? Fig. 48. Figure 47, or an arch, like Figure 48, will exert a greater thrust than either Figure 44 or Figure 46, when loaded with the same weight. The distance, A B, is termed the rise of the arch, C D, the span, and upon their relative values the thrust of the arch will depend. In a semi-circular arch, Figure 49, no thrust is exerted at its very lowest points, A and B ; it Fig. 49, does not become sensible until we. 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 Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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