A two-page article from Posselt's Textile Journal, January 1915, explaining how to construct 70-degree steep diagonal twills from regular 45-degree foundation twills by using every third warp thread. It works through examples with weave drawdowns (Figs. 1-29), giving repeat sizes from 4 by 12 up to 16 by 48 and the harness reductions that result when the foundation twill repeat is a multiple of 3.