. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 126 LECTURE. Fis. 45. sustain three loads instead of a single one, we sliall have a structure . _ such as Figure 45. If the number of loads is very great, or, what is the same thing, if the load is distributed over the whole span, we shall have the framing in the form of a polygon of a great number of sides, or an arch^ as in Figure 46. Since the pieces com- posing such a framing or arch are small, and are only subjected to a force of compr
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 126 LECTURE. Fis. 45. sustain three loads instead of a single one, we sliall have a structure . _ such as Figure 45. If the number of loads is very great, or, what is the same thing, if the load is distributed over the whole span, we shall have the framing in the form of a polygon of a great number of sides, or an arch^ as in Figure 46. Since the pieces com- posing such a framing or arch are small, and are only subjected to a force of compression, they may be economically made of stone or of cast iron. In Figure 44, by a well-known principle of mechanics, the amount of thrust, or tendency to separate the abutments, com- p. ^g pared with the weight supported, (W,) may be readily determined, and it will be found to increase with the nearer approach of the. 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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