Elements of Mechanical Drawing

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D.C. Heath and Company, 1894 - Mechanical drawing - 98 pages
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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.

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