Anthony Florian Madinger Willich, Domestic Encyclopædia (1802)
“ The mechanism of felting is equally simple and curious; though its theory is little understood, even by professional hatters.—As the surface of hair and wool is by no means smooth, but formed either of plates resembling the scales of fish, or of zones placed over each other, as we find in the structure of horns, it follows that hair or wool, when promiscuously entangled, cannot be easily disengaged, on account of its rough sides, which may be readily perceived, by drawing a hair between the fingers against the root-end. ”
