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This post is from the book “The New Metal Worker Pattern Book”, by George Watson Kittredge.Â It is also also available from Amazon –Â The New Metal Worker Pattern Book: A Treatise On the Principles and Practice of Pattern Cutting As Applied to Sheet Metal Work" target="_blank">The new metal worker pattern book.
The New Metal Worker Pattern Book: A Treatise On the Principles and Practice of Pattern Cutting As Applied to Sheet Metal Work">
The volute is an architectural figure of a geometrical nature based upon the spiral, and is of quite frequent occurrence in one form or another, consequently some remarks upon the different methods of drawing it will not be out of place.
81. To Draw a Simple Volute. – Let D A, in Fig. 225, be the width of a scroll or other member for which it is desired to draw a volute termination. Draw the line D 1, in length equal to three times D A, as shown by D A, A B and B 1. From the point 1 draw 1 2 at right angles to D 1, and in length equal to two-thirds the width of the scroll – that is, to two-thirds of D A. From 2 draw the line 2 3 perpendicular to 1 2, and in length equal to three-quarters of 1 2. Draw the diagonal line 1 3. From 2 draw a line perpendicular to 1 3, as shown by 2 4, indefinitely. From 3 draw a line perpendicular to 2 3, producing it until it cuts the line 2 4 in the point 4. From 4 draw a line perpendicular to 3 4, producing it until it meets the line 1 3 in the point 5. In like manner draw 5 6 and 6 7. The points 1, 2, 3, 4, etc., thus obtained are the centers by which the curve of the volute is struck. From 1 as center, and with 1 D as radius, describe the quarter circle D C. Then from 2 as center, and 2 C as radius, describe the quarter circle C F, and so continue using the centers in their numerical order until the curve intersects with the other curve beginning at A and struck from the same centers, thus completing the figure, as shown.
82. To Draw an Ionic Volute. – Draw the line A B, Fig. 226, equal to the hight of the required volute, and divide it into seven equal parts. From the third division draw the line 3 C, and from a point on this line at any convenient distance from A B describe ft circle, the diameter of which shall equal one of the seven divisions of the line A B. This circle forms the eye of the volute. In order to show its dimensions, etc., it is enlarged in Fig. 227. A square, D E F G, is constructed, and the diagonals G E and F D are drawn. F E is bisected at the point 1, and the line 1 2 is drawn parallel to G E. The line 2 3 is then drawn indefinitely from 2 parallel to F D, cutting G E in the point H. The distance from H to the center of the circle O is divided into three equal parts, as shown by H a b O. The triangle 2 O 1 is formed. On the line O H set off a point, as c, at a distance from O equal to one-half of one of the three equal parts into which O H has been divided. From c draw the line c 3 parallel to 1 O, producing it until it cuts 2 3 in the point 3. From 3 draw the line 3 4 parallel to G E indefinitely. From the point c draw a line c 4 parallel to 2 O, cutting the line 3 4 in the point 4, completing the triangle c 3 4 From 4 draw the line 4 5 parallel to F D, meeting 1 O in the point 5. From 5 draw the line 5 6 parallel to G E, meeting the line 2 O in the point 6. From 6 draw the line, G 7 parallel to F D, meeting the line c 3 in the point 7.
Fig. 225. – To Draw a Simple Volute.