Theory and analysis of ornament applied to the work of elementary and technical schools (1892)
Schauermann, François Louis · London, S. Low, Marston · leaf 63
Theory a^id Analysis of Ornament, 5 1 idea of their inflection. The angles (1) and (2) possess an axis of symmetry, or a linear diameter (2') ; (3) has a diameter, but it is curvilinear, caused by the junction of the normal line (3'), by the centres of a series of parallels (3''), or by the centres… … 4. Contact or taction (Fig. 6). Two arcs, one touching the other at their extremities, can be equal (2) or unequal (1). If they are equal, they give a particular figure (2), symmetrical or quartered, when the arcs touch one another at their centres of figure. We can conceive that these two figures…
Decoration and ornament
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