"New Yarn Knopping Motion" - Wm. Whiteley & Sons Ltd, Textile Machinists, Lockwood, Huddersfield, 1927. Article reprinted from "The Textile Manufacturer" advertising an attachment for Twisting frames which will add knops to threads.Four page booklet featuring a black and white image of a machine on the front. textile machinery, wm. whiteley and sons limited, knopping, twisting machinery, textile inudstry, huddersfield, lockwood, england