Jackson, Frank G · London : Chapman & Hall · leaf 143
DIRECTION OF LINES. 12 ? take the same course, indicated in the figure by the … border, the termination of the spiral 2 is drawn so as to follow the trajectory of the line 3, as well as to repeat the boundary line. The same is done with line 4. Of course, when arranging lines in continuity, due regard must be paid to the spaces enclosed, which must be agreeable in form and…
Decoration and ornament
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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