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.
The governing principles underlying all such operations are the same as every sheet-metal worker uses in the laying out of the simple patterns in flaring ware. In other words, one who understands how to lay out the pattern for a frustum of a cone understands the principles of developing the blanks for curved mouldings. The principles will be described in detail in what follows.
Our first problem is that of obtaining a blank for a plain flare, shown in Fig. 340. First draw the center line A B, and construct the half-elevation of the mould, as C D E F. Extend D E until it intermeets the center line A B at G. At right angles to A B from any point, as H, draw H 1 equal to C D, as shown. Using H as center, and with
RESIDENCE OF DR. FOLTZ, CHESTNUT HILL, PHILADELPHIA, PA.
George T. Pearson, Architect, Philadelphia, Pa.
Planned to Meet the Requirements of a Physician's Residence and Office. The Exterior Treatment, as Indicated by the Timber Framings, Truncation of Roof, etc., is in the Dutch Style, the Base being Stone, Then a Band of Flemish-Bond, Dark Header Brickwork, and, above that. Rough Brick Walls Stuccoed. Plan Shown on opposite page.
PLAN OF RESIDENCE OF DR. FOLTZ, CHESTNUT HILL, PHILADELPHIA, PA.
George T. Pearson, Architect, Philadelphia, Pa.
Interior Woodwork is Treated in Dutch Style, of Dark Chestnut in Hall and Dining Room, and Painted Wood in Living Room and Second Story. Ceilings of First Story Have Beams Exposed and Finished in Places with Quaint Carvings and Scroll Decoration Characteristic of the Dutch Stye. Exterior View Shown on Opposite Page.
H 1 as radius, describe the quarter-circle 1 7, which is a section on C D. Divide 1 7 into equal spaces, as shown. Now using G as center, with radii equal to G E and G D, describe the area D 7' and E Eo. From any point, as I', draw the radial line 1' G, intersecting the inner arc at Ex. Take a stretchout of the quarter-section; place it as shown from 1' to 7'; and draw a line from 7' to G, intersecting the inner arc at Eo. Then will Ex 1' 7' Eo be the quarter-pattern for the flare D E in elevation. If the pattern is required in two halves, join two pieces; if required in one piece, join four pieces.
In Fig. 341 is shown a curved mould whose profile contains a cove. To work this profile, the blank must be stretched with the stretching hammer. We mention this here so that the student will pay attention to the rule for obtaining patterns for stretched moulds. First draw the center line A B; also the half-elevation of the moulding as C D E F.
Divide the cove E D into an equal number of spaces, as shown from a to e. Through the center of the cove c draw a line parallel to e a, extending it until it meets the center line A B at G, which is the center point from which to strike the pattern. Take the stretchout of the cove c e and c a, and place it as shown by c e' and c a'. When stretching the flare a' e', c remains stationary, e' and a' being hammered towards e and a respectively. Therefore, from c erect a vertical line intersecting H 1, drawn at right angles to A B, at 1. Using H as center and H 1 as radius, describe the arc 1 7, which divide into equal spaces as shown. With G as center, and radii equal to G a', G c, and G e',, describe the arcs e" e", 1' 7', and a" a". Draw a line from e" to G, intersecting the center and lower arcs at 1' and a". Starting from 1', lay off the stretchout of the quarter-section as shown from 1' to 7'. Through 7' draw a line towards G, intersecting the inner arc at a"; and, extending the line upward, intersect the outer arc at e". Then will a" e" e" a" be the quarter-pattern for the cove E D in elevation. If the quarter-round N O were required in place of the cove E D, then, as this quarter-round would require to be raised, the rule given in the former Instruction Paper on Sheet Metal Work would be applied to all cases of raised mouldings.
In Fig. 342 is shown a curved mould whose profile is an ogee. In this case as in the preceding, draw the center line and half-elevation, and divide the ogee into a number of equal parts, as shown from a to h. Through the flaring portion of the ogee, as c e, draw a line, extending it upward and downward until it intersects the center line A B at G. Take the stretchouts from a to c and from e to h and place them respectively from c to a' and from e to h' on the line h' G. Then, in working the ogee, that portion of the flare from c to e remains stationary; the part from e to h' will be stretched to form e h; while that part shown from c to a' will be raised to form c a. From any point in the stationary flare, as d, erect a line meeting the line H 1, drawn at right angles to A B, at 1. Using H as center and H I as radius, describe the quarter-section, and divide same into equal spaces, as shown. With G as center and with radii equal to G a', G d, and G h', describe the arcs a" a", 1' 7', and h" h". From h" draw a line to G.
Starting at 1', lay off the stretchout of the section as shown from 1' to 7'. Through 7' draw a line to G, as before described. Then will h" a" a" h" be the quarter-pattern for the ogee E D.
In Fig. 313 is shown how the blanks are developed when a bead moulding is employed. As before, first draw the center line A1 B1 and the half-elevation A B C D. As the bead takes up 3/4 of a circle, as shown by a c e f, and as the pattern for f c will be the same as for e c, then will the pattern for c e only be shown, which can also be used for e f. Bisect a c and c e, obtaining the points b and d, which rep resent the stationary points in the patterns. Take the stretchouts of b to a and b to c, and place them as shown from b to a', and from b to c'; also take the stretchouts of d to c and d to e, and place them from d to c' and from d to e' on lines drawn parallel respectively to a c and c e from points b and d. Extend the lines e' c' and c' a' and until they intersect the center line A1 B1 at E and F respectively. From the points b and d erect lines intersecting the line G 1, drawn at right angles to A1
B1, at 14 and 1 respectively. Using G as center, and with radii equal to G 14 and G 1, describe quarter-sections, as shown. Divide both into equal parts, as shown from 1 to 7, and from 8 to 14. With E as center, and with radii equal to E c', E d, and E e', describe the arcs c" c", d' d', and e" e". From any point on one end, as e", draw a radial line to E, intersecting the inner arcs at d' and c". Now take the stretchout of the section from 1 to 7, and, starting at d', lay off the stretchout as shown from 1' to 7'. Through 7' draw a line towards E, intersecting the inner arc at c" and the outer one at e". Then will c" e" e" c" be the quarter-pattern for that part of the bead shown by c e, also for e f, in elevation. For the pattern for that part shown by a c, use F1 as center; and with radii equal to F a', F b, and F c', describe the arcs a" a", b' b', and c" c". From any point on the arc b' b', as 8', lay off the stretchout of the quarter-section 8 14, as shown from 8' to 14'. Through these two points draw lines towards F1, intersecting the inner arcs at a" a"; and extend them until they intersect the outer arc at c" and c". Then will c" a" a" c" be the desired pattern.