Forging or thin and raised metal construction affords many examples of the adaptability of material in constructing appendages. Rivets form decorative features at the junction points and should be placed with great care and relation to the decoration and the point of tangency.
Plate 19
INSTRUCTION SHEET FOR CLASS PRESENTATION
The typical views to be used in classroom work, with the ordinary range of problems, are shown on [Plate 19]. These typical views should be supplemented by dimensions, cross sections, and other views whenever necessary. Wood construction has been omitted from this sheet, but its development in design is quite similar to the steps indicated in the summary.
SUMMARY OF DESIGN STEPS
(a) Draw the primary rectangle.
(b) Subdivide the rectangle into two or three horizontal and, if necessary, vertical divisions.
(c) Estimate the dimensions of the appendage necessary to perform the desired service in the best manner.
(d) If the appendage is a handle, place it in such a position that it not only appears to but actually does support the weight of the primary mass.
(e) Complete the contour curves of the primary mass based upon the horizontal division which acts as a unit of measurement or a turning point.
(f) Join the appendages to the primary mass by means of tangential curves.
(g) Establish unity between the primary mass and the appendages by applying Rules 4a, 4b, and 4c.
(h) Dimension and otherwise prepare the drawing for shop use. See [Plate 26].
SUGGESTED PROBLEMS
Design a sugar bowl, cream pitcher, and teapot. Consider them as different members of one set.
Design a sideboard 3 feet 3 inches high with plate rack, the design to contain two vertical and two horizontal divisions exclusive of the appendage.
SUMMARY OF RULES
Rule 4a. The appendage should be designed in unity with, and proportionately related to, the vertical or horizontal character of the primary mass, but subordinated to it.
Rule 4b. The appendage should have the appearance of flowing smoothly and, if possible, tangentially from the primary mass.
Rule 4c. The appendage should, if possible, echo or repeat some lines similar in character and direction to those of the primary mass.
REVIEW QUESTIONS
1. State the nature and use of the appendage.
2. What is the relation of the size of the appendage to the size of the primary mass?
3. How should the appendage be attached to the primary mass?
4. How does Rule 4c help to secure unity between the appendage and the primary mass?
5. Are compass curves permissible in appendage design?
6. State influence of tools and materials upon appendage design.
Chapter VI
ENRICHMENT OF THE CONTOURS OR OUTLINES OF DESIGNS IN WOOD
With this chapter we introduce contour enrichment, the second major division of industrial arts design.