German-language article from 1927 by engineer Paul Laetsch on irregularities (thick and thin places) in cotton roving and yarn and how to detect them. It proposes counting twists per inch with a twist counter as a practical way to infer variation in yarn thickness, and gives two worked examples (a No. 36 warp yarn and a combed Mako cotton No. 65) showing twist variations of about 54 to 65 percent. The text breaks off with "to be continued"; the figure is a black-board winding of yarn used for visual inspection.