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angle of 30 axes axis base Bisect called centre circle circular arcs compasses cone Connect construct curve cutting plane cylinder describe arc determined diameter dimensions distance Divide divisions draw draw A C drawn edges elements ellipse equal extremity face figure four front axis front plane front view Geometrical given given point head height hexagon horizontal illustrates indicated inking inscribe known latter major axis manner means measured method minor axis move necessary object oblique observed obtained opposite parallel pencil perpendicular pitch plane of projection PLATE point of intersection portion position Practical preceding prism PROB PROBLEM pyramid radius remaining represent representation revolved right angles scale seen shown in Fig side view similar space square straight line Suppose surface tangent thread top view triangle vertex vertical axis
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.