Faber Birren's article for The Melliand Textile Monthly sets out principles of color harmony for textile designers. It describes how color dimension, diffusion, opposites and after-image outlines can be used to plan color schemes. It then divides harmony into analogies (of tone, of colors, of a dominant color) and attraction (contrast of brightness, purity and colors), illustrated with a circular color chart showing eight hues of equal gray tone. The scan also includes a page from an unrelated technical article describing the eriometer, a diffraction instrument for measuring wool fiber diameter.