. Bulletin - New York State Museum. Science. Fig. 85 Fig. 86 1 The tetragonal sphenoid (fig. 85, 86) is composed of four isos- celes triangles which meet the horizontal axes at equal dis- tances; they also intersect the vertical axis. Two sphenoids are possible which include all the faces of the pyramid of the first order of the normal group. The form is analogous to the tetrahedron of the isometric system. 2 The tetragonal scalenohedron (fig. 87) is composed of eight scalene triangles, which intersect the horizontal axes un- Fig. 87 equally. As with the sphenoid there are two complementary sc
. Bulletin - New York State Museum. Science. Fig. 85 Fig. 86 1 The tetragonal sphenoid (fig. 85, 86) is composed of four isos- celes triangles which meet the horizontal axes at equal dis- tances; they also intersect the vertical axis. Two sphenoids are possible which include all the faces of the pyramid of the first order of the normal group. The form is analogous to the tetrahedron of the isometric system. 2 The tetragonal scalenohedron (fig. 87) is composed of eight scalene triangles, which intersect the horizontal axes un- Fig. 87 equally. As with the sphenoid there are two complementary scalenohedrons possible for every different ratio of the intercepts on the horizontal axes. Up to the present. 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 New York State Museum; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
