Industrial Drawing and Geometry: An Introduction to Various Branches of Technical Drawing

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Longmans, Green, and Company, 1911 - Geometrical drawing - 169 pages

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Page 73 - Thus a parabola is the locus of a point which moves so that its distance from a fixed point is equal to its distance from a fixed straight line (see fig.
Page 32 - A sector, is any part of a circle bounded by an arc, and two radii, drawn to its extremities. A quadrant, or quarter of a circle, is a sector having a quarter part of the circumference for its arc, and the two radii perpendicular to each other.
Page 32 - An arc of a circle is any part of the circumference. A chord is a straight line joining the extremities of an arc. A segment is any part of a circle bounded by an arc and its chord.
Page 78 - A conic section is the locus of a point which moves so that its distance from a fixed point, called the focus, is in a constant ratio to its distance from a fixed straight line, called the directrix.
Page 165 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Page 55 - THEOREM. The sum of all the interior angles of a polygon, is equal to twice as many right angles, less four, as the figure has sides.
Page 166 - A cone is a body conceived to be formed by the revolution of a right-angled triangle about one of its sides containing the right angle.
Page 32 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Page 155 - However, a similar effect can be easily produced by a few shading lines, i which are or should be drawn in accordance with the rules followed in shading proper. To commence with a simple example, that very often in many forms appears on machine drawings, we have in Fig. 19 a' vertical hexagonal prism, with its front face in the light or illuminated. Such surfaces parallel to the vertical plane would receive flat tints, and the nearer the surface is to the eye the lighter such tints would be, and...
Page 43 - Prove that parallelograms on the same base and between the same parallels are equal in area.

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