The essentials of descriptive geometry . Fig. 122. 158 ESSENTIALS OF DESCRIPTIVE GEOMETRY. from the surface while another set perpendicular to the first setwill cut parabolas. (See Fig. 123.) As practical examples of this surface the pilot on alocomotive and the bow ofa ship may be cited. If one directrix is a curvedhne and one remains astraight line the surface be-comes a conoid. An ex-ample of such a surface_^ may be found in chiselsFig. 123. - An hyperboUc paraboloid. Note shaped from round bar stockthat planes parallel to the base of the and in the bows of ships,model wUl cut out _ hyperbo
The essentials of descriptive geometry . Fig. 122. 158 ESSENTIALS OF DESCRIPTIVE GEOMETRY. from the surface while another set perpendicular to the first setwill cut parabolas. (See Fig. 123.) As practical examples of this surface the pilot on alocomotive and the bow ofa ship may be cited. If one directrix is a curvedhne and one remains astraight line the surface be-comes a conoid. An ex-ample of such a surface_^ may be found in chiselsFig. 123. - An hyperboUc paraboloid. Note shaped from round bar stockthat planes parallel to the base of the and in the bows of ships,model wUl cut out _ hyperbolas, and that pjg_ ^31 shows an obHqueplanes parallel to its ends will cut out . , 1 -r-,. 1 parabolas. ^^o^oid, and Fig. 124 shows a stringmodelof a right conoid. Where both directrices become curved Hues the surfacebecomes a 122 shows such asurface and illustratesthe skewed arch, one ofthe useful applicationsof the surface. Thecylindroid is also madeuse of in buildings forconnecting arched pas-sageways at different ele-vations. Many interesting ap-pKcations of these a
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400462, bookyear1915
