Elements of Descriptive Geometry: With Its Applications to Spherical Projections, Shades and Shadows, Perspective and Isometric Projections |
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Common terms and phrases
Analysis auxiliary plane bisecting centre circumference curve of intersection curve of shadow determined diameter dicular diedral angles directrices edge ellipse equal equator generatrix given line given point given right line ground line hence hori horizontal plane horizontal projection horizontal trace hyperbola hyperboloid isometric projection jection Let MN line parallel line pierces meridian curve meridian plane orthographic projection pass a plane perpen pierces H pierces the horizontal pierces the plane plane be passed plane directer plane intersects plane of projection plane of rays plane perpendicular plane tangent point of contact point of sight polar distance preceding problem primitive circle primitive plane projecting plane radius ray of light rectilinear elements required curve required plane required point Revolve this plane revolved position shadow cast single curved surface sphere surface of revolution tangent plane true position upper base vanishing point vertex vertical plane vertical projection vertical trace warped surface
Popular passages
Page 27 - F'. These points will be the foci, for DF + DF' = 2CV = VV. IV. The hyperbola, which may be generated by moving a point in the same plane, so that the difference of its distances from two fixed points shall be equal to a given line. The two fixed points are the foci.