Abstract
The light reflected from individual undyed wool fibers or from arrays of a few separate and parallel dyed fibers, with similar root-tip orientation, has been measured for a range of angles of illumination. With dyed fibers, there is a strong peak of reflectance at certain angles of illumination, which is shifted from one side of the mirror angle to the other, when root-tip orientation is reversed. This shift is four times the average angle between the scale surface and the fiber axis. It is independent of the fiber diameter in the material examined. The shift of the peak for wool ranges from 11° to 18° ; for mohair, from 5° to 7°, corresponding to average scale angles of 3.7° for wool and 1.5° for mohair.
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