This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...SURFACES 87. A cylindrical surface is represented by the plan and elevation of some curve of the surface and of the limiting elements of the surface. For convenience this curve is usually taken in H or V and is therefore the locus of the points in which the elements of the surface pierce H or V. 88. In a cylinder this ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...SURFACES 87. A cylindrical surface is represented by the plan and elevation of some curve of the surface and of the limiting elements of the surface. For convenience this curve is usually taken in H or V and is therefore the locus of the points in which the elements of the surface pierce H or V. 88. In a cylinder this curve is called a base and for convenience it is taken as a rule either in H or V, or in a plane parallel to H or V. Since the base of a cylinder must be a closed curve, cytinders will be either circular or elliptical in section, or the section will be some irregular closed plane curve such as, for example, would be formed by cutting a corrugated tin pipe. When a cylinder with a circular right section is inclined to H or V its bases in those planes will be ellipses; when the cylinder is elliptical in right section and is inclined to H or V its bases will, in general, be ellipses, although if the angle of the inclination be properly adjusted they may become circles. Thus, in Fig. 80 is a cylinder with a circular base in H. This cylinder must be elliptical in section. In Fig. 81 is a cylinder with an elliptical base in V. This cylinder may be either circular or elliptical in section, according to the angle its axis makes with V. 89. Cylinders are denned by their bases. Thus: a cylinder with a circular base; a cylinder with an elliptical base, etc. A right cylinder is one whose elements are perpendicular to the plane of its base. Such cylinders may be either circular or elliptical in section and are generally named accordingly, as a right circular cylinder, or a right elliptical cylinder. 90. To assume a point on the surface of a cylinder it is necessary only to assume an element of the surface and on this element locate the point. In Fig. 80, OP...
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