Rule 10j. All surface enrichment should have an appearance of compactness or unity. Pierced spots or areas should be so used as to avoid the appearance of having been scattered on the surface without thought to their coherence.
Rule 10k. Built, carved, and chased enrichment should have the higher planes near the point of concentration. It is well to have the stone as the highest point above the primary mass. When using this form of enrichment the stone should never appear to rise abruptly from the primary mass, but should be approached by a series of rising planes.
Rule 10l. The lanes or margins between enameled spots should be narrower than the lane or margin between the enamel and the contour of the primary mass.
Rule 10m. Transparent and opaque stones or enamel should not be used in the same design.
Postulate.—The design should conform to the limitations and requirements of tools, processes, and materials, and should be durable and suitable for service.
REVIEW QUESTIONS
1. What is often used as a point of concentration in the surface enrichment of precious metals? Why?
2. State direction of the inceptive axis for problems similar to: (a) tie pins, (b) pendants, (c) fobs, (d) rings, (e) bar pins? Why? Under what grouping of planes may they be placed?
3. State the relation between the point of concentration and the inceptive axis.
4. Give three steps in the design evolution of surface enrichment for small flat planes.
5. Describe briefly eleven decorative processes for the surface enrichment of precious metals with the technical rendering of each.
6. Illustrate examples of dependent contour and dependent surface enrichment of precious metals.
7. Where should a stone in a design similar to a pin or brooch be placed with reference to the inceptive axis and the geometric center of the primary mass?
8. Illustrate manner of planning primary mass, inceptive axis, point of concentration, contour, and surface enrichment of: (a) pins, (b) fobs, (c) rings, (d) pendants and chains.
9. State the relation of stone or enamel to metal.
10. What rule should govern the amount of metal used in a design?
11. State the objection to a design with contour and surface enrichment equally elaborated.
12. Is it possible to vary the design motive of a chain from that of a pendant? Why and how?
13. Give illustration and requirements of a good design in champleve enamel.
14. What precautions should be exercised in designing pierced enrichment?
15. What rules should be observed in designing a built-up or carved design?
Plate 58
Chapter XIV
SURFACE ENRICHMENT OF LARGE PRIMARY MASSES IN BASE AND PRECIOUS METALS
Enrichment for Small Areas
The surface enrichment of small, flat primary masses treated in [Chapter XIII] emphasized the designer's tendency for full surface enrichment of small areas. Such treatment has proved satisfactory because the eye can readily and immediately observe and comprehend or assimilate an enrichment upon a small area. For larger enriched areas considered in this chapter, full surface enrichment becomes a questionable policy for the following reasons.