Page:Ware - The American Vignola, 1920.djvu/36

26 A 45-degree line also gives: The Shape of the Metope, Fig. 85. The Caps of the Pedestals, except the Tuscan, Fig. 87. The Plinths of the Doric and Attic Bases, Fig. 87.

Lines drawn at an angle of 45 degrees across the Corinthian Capital from the extremities of its lower diameter give: The width of the Abacus, Fig. 88.

Where they cut the line of the upper diameter of the shaft, extended, they give: The depth of the Scroll, Fig. 88. LINES AT 60 DEGREES

In like manner, lines drawn at an angle of 60 degrees through the Bed Mold of the Ionic Cornice from a point on the axis of the Column, taken either on the upper line of the Frieze or on the upper edge of the Dentil Band, give, where they touch the upper line of the Frieze and the upper line of the Dentil Band:

The Axes of the Dentils, and the outer face of the Double Dentil, Fig. 89.</ol>

Similar lines drawn at 60 degrees in the Corinthian Cornice, taken from a point where the axis of the Column cuts the lower edge of the Corona, give:

(a) Where they cut the lower edge of the Corona, the upper line of the Frieze, and the lower line of the Ovolo: <li>The Axes of the Modillions and of the Dentils, and the outer face of the Double Dentil, very nearly, Fig. 90.</li></ol>

(b) Where they cut the lower line of the Modillion Band: <li>The width of the Modillion, and the outer face of the Modillion Band, Fig. 90.</li></ol>

(The distance from the edge of the Corona down to the lower edge of the Modillion Band is one-third the distance down to the top of the Frieze, and the distance down to the lower edge of the Ovolo, one-half.)

THE IONIC VOLUTE The vertical line a b, Fig. 91, through the center of the eye of the Ionic Volute, and the horizontal line c d, will mark in the circumference of the eye the four corners of a square within which a fret may be drawn whose angles will  serve as centers, from which the curves of the volute may be described mechanically. The sides of the square above referred to should be bisected, and through the upper points thus located a horizontal line e f should be drawn. Now, with e g as a radius, the arc g f may be drawn as the first section of the volute. Now, through the point h, where the line e f bisects the side of the square, a vertical line h k should be drawn, and with h f as a radius the arc f k may be struck. From h and e lines should be drawn at 45 degrees, intersecting at the center of the eye, and the line