Cyclopedia of Architecture: Architectural drawing. Lettering

Amer. tech. soc., 1912
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Page 48 - 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 46 - The slant height of a regular pyramid is the altitude of any one of the lateral faces, as WE.
Page 43 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Page 58 - ... inches) describe an arc cutting AC at E and F. The radius of this arc must always be such that it will cut AC in two points; the nearer the points E and F are to A and C, the greater will be the accuracy of the work. Now with E and F as centers and any convenient radius (about 2^ inches) draw the arcs intersecting below AC at T. A line through the points P and T will be perpendicular to A C. In case there is not room below AC to draw the arcs, they may be drawn intersecting above the line as...
Page 125 - These lines will be the centers of the letters, as shown at A, B, D and E. The vertical lines of the letters should not radiate from the center of the arc, but should be parallel to the center lines already drawn; otherwise the letters will appear distorted. Thus, in the letter N the two verticals are parallel to the line A. The same applies to the other letters in the alphabet.
Page 11 - T-- square place the triangle so that the other 45-degree angle is in the position occupied by the first. If the two 45-degree angles coincide they are accurate. Triangles are very convenient in drawing lines at right angles to the T-square. The method of doing this is shown in Fig. 10. Triangles are also used in drawing lines at an angle with the horizontal, by placing them on the board as shown in Fig. 11. Suppose the line EF (Fig. 12...
Page 97 - Fig. 38. ments of the four pieces. In order to construct the various parts making up the joint, it is necessary to know what shape and size must be marked out on the flat sheet metal so that when cut out and rolled up the three pieces will form cylinders with the ends fitting together as required. Knowing the kind of elbow desired, we first draw the plan and elevation, and from these make the developments.
Page 55 - Cycloid. The cycloid is a curve generated by a point on the circumference of a circle which rolls on a straight line tangent to the circle.
Page 20 - The curve is shifted for this work from one position to another. It frequently facilitates the work and improves its appearance to draw a free hand pencil curve through the points and then use the irregular curve, taking care that it always fits at least three points. In inking the curve, the blades of the pen must be kept Fig. 31. tangent to the curve, thus necessitating a continual change of direction.
Page 95 - ... element is taken from the elevation A, of either contour element. All of the elements of the cone are of the same length, so when the cone is rolled each point of the base as it touches the plane will be at the same distance from the vertex. From this it follows that the development of the base will be the arc of a circle of radius equal to the length of an element. To find the length of this arc which is equal to the distance around the base, divide the plan of the circumference of the base...