Elements of Mechanical Drawing |
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Common terms and phrases
angle of 15 angle of 30 axes axis of projection base Bisect centre line circular arcs circumscribe cone cutting plane describe arc developed surface distance Divide dotted lines Draw a tangent draw arcs draw lines elements ellipse equilateral triangle face foci front and side front axis front plane front view frustum Geometrical given circle given line given point helices helix hyperbola illustrates inking isometric drawing isometric projection isosceles triangle line A B line drawn major axis minor axis number of equal oblique OBLIQUE PROJECTION parabola parallel parallelopiped pencil perpendicular pitch plane of projection PLATE point of intersection polygon prism PROB PROBLEM projecting line pyramid radius equal revolution REVOLVE THE OBJECT revolved position REVOLVED SECTION right angles right line scalene triangle shade lines shown in Fig side axis straight line thread top view TRIANGULAR PRISM true length vertex vertical axis
Popular passages
Page 25 - The altitude of the pyramid is the perpendicular distance from the vertex to the base. A pyramid is called triangular, quadrangular, etc., according to the shape of the base.
Page 49 - 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. The curve may be constructed by points, thus : Let F and F', Fig. 36, be the two foci, and VV the given line, so placed that FV = F'V. With F' as a centre, and any radius greater than F'V, as F'O, describe an arc.
Page 26 - The altitude of a cylinder is the perpendicular distance between the bases. A circular cylinder is a cylinder whose base is a circle.
Page 26 - A cylinder is a solid bounded by a cylindrical surface and two parallel planes intersecting this surface.
Page 48 - A circle is the path of a point moving in a plane so that its distance from a given point is constant.
Page 22 - Thus when it is said that the sum of the three angles of any triangle is equal to two right angles, this is a theorem, the truth of which is demonstrated by Geometry.
Page 14 - Do not overload the pen with ink, Having filled the pen, nearly close' the nibs and try the width of the line on a piece of paper or the margin of the drawing. Never refill or lay the pen aside without first cleaning it.
Page 24 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Page 24 - DBF. A segment of a circle is a portion of a circle bounded by an arc and its chord, as ACD.
Page 26 - A cylinder of revolution is a cylinder generated by the revolution of a rectangle about one side as an axis.