This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
In Fig. 315 are shown the principles employed for obtaining the patterns for the side, face, sink strips, cap, and returns for a raking bracket, These principles can be applied to any form or angle in the bracket of gable moulding respectively. Let S U V T represent part of a front elevation of a raking cornice placed at its proper angles with any perpendicular line. In its proper position, draw the outline of the face of the bracket as shown by E G M O. Also, in its proper position as shown, draw the normal profile of the side of the bracket, indicated by 6-Y-Z-15; the normal profile of the cap-mould, as W and X; and the normal profile of the sink strip, as indicated by 10 10' 15' 15. Complete the front elevation of the bracket by drawing lines parallel to E O from points 7 and 9 in the normal profile; and establish at pleasure the width of the sink strip in the face of the bracket, as at J K and L H. To complete the front elevation of the cap-mould of the bracket, proceed as follows: Extend the lines G E and M O of the front of the brackets, as shown by E 6 and O 6, on which, in a vertical position as shown, place duplicates (W1, W2) of the normal profiles W and X, divided into equal spaces as shown by the figures 1 to 6 in W1 and W2. From these intersections in W1 and W2, drop vertical lines, which intersect by lines drawn parallel to E O from similarly numbered intersections in X, and trace lines through the points thus obtained. Then will R E and O P represent respectively the true elevations, also the true profiles, for the returns at top and foot of the cap of the raking bracket.
Now divide the normal profile of the bracket into equal spaces, as shown by the figures 6 to 15, through which, parallel to EO, draw lines intersecting the normal sink profile from 10' to 15' and the face lines of the bracket EFG, JH, KL and ONM, as shown. To obtain the true profile for the side of the barcket on the lines OM and GE, proceed as follows: Parallel to OM, draw any line, as Y1 Z1; and at right angles to OM, and from the various intersectinos on the same, draw lines indefinitely, crossing to the line Y1 Z1 as shown. Now, measuring in ecah instance from the line YZ in the normal profile, take the various distances to points 6 to 5 and 15' to 19', and place them on similarly numbered lines measuring in each and every instance from the line and 10' 10" 15" 15' the pattern for the sink strip shown by the lines K L and H J in the front.
Y' Z', thus obtaining the points 6' to 16' and 15" to 10", as shown.
Trace a line through the points thus obtained. Then will Y1 6' 7' 9' 10' 15' Z' be the pattern for the side o the raking bracket.
For the pattern for the face strip B, draw any line, as A1 B1, at right angles to G M, upon which place the stretchout of 10 15 in the normal profile, as shown from 10 to 15 on A1 B1. Through these points, at right angles to A1 B1, draw lines as shown, which intersect with lines drawn from similar intersections on the lines F G and H J. Trace a line through points thus obtained as shown by F° G° H° J°, which will be the pattern for the face B, B.
For the pattern for the sink-face C, draw C1 D1 at right angles to GM, upon which place the stretchout of 10' 15' in the normal profile as shown from 10' to 15' on C1 D1, through which, at right angles to C1 D1, draw lines, which intersect by lines drawn from similar intersections on K L and H J. Trace a line through the points so obtained as J° K° L° H°, which is the pattern for the sink-face C.
The pattern for the cap D and the face A will be developed in one piece, by drawing at right angles to EO the line E1 F1. At right angles to E1 F1, and through the figures, draw lines, which intersect with lines drawn at right angles to EO from similarly numbered intersections on REF and NOP. A line traced through the points thus obtained, as shown by R° E° F° and N° 0° P° will be the pattern for D and A.
For the patterns for the cap returns R E and O P, draw any line at right angles to 1 1 in the normal profile, as H1 G1, upon which place the stretchouts of the profiles R E and O P, being careful to carry each space separately onto the line H1 G1, as shown respectively by 6v lv nd 6x 1x. Through these points draw lines at right angles to G1 H1, which intersect by lines drawn at right angles to 1 1 from similar numbers in W and X. Trace lines through the points thus obtained. Then will N1 O1 R1 S1 be the pattern for the lower return of the cap, R E; while J1 M1 L1 K1 will be the pattern for the upper return, PO.
In Fig. 316 is shown a perspective view of a gutter or cave-trough at an exterior angle, for which an outside miter would be required. It is immaterial what shape the gutter has, the method of obtaining the pattern for the miter is the same. In Fig. 317 let 1 9 10 represent the section of the cave-trough with a bead or wire edge at a b c; divide the wire edge, including the gutter and flange, into an equal number of spaces, as shown by the small divisions d to 1 to 9 to 10. Draw any vertical line, as A B, upon which place the stretchout of the gutter as shown by similar letters and numbers on A B, through which, at right angles to A B, draw lines, which intersect by drawn parallel to A B from similar points in the section. Trace a line through the points thus obtained. Then will C D E F be the pattern for the outside angle shown in Fig. 316.
If a pattern is required for an interior or inside angle, as is shown in Fig. 318, it is necessary only to extend the lines C D and F E in the pattern in Fig. 317, and draw any vertical line, as J H. Then will J D E H be the pattern for the inside angle shown in Fig. 318.