THREAD. The filaments of fibrous sub stances spun out for weaving are in a general sense called threads, the specific name of such filaments being yarn. Thread in a specific sense consists of two or more filaments of yarn twisted together for greater strength; when the filaments do not exceed two this is called doubling and the manufacturing process is doubling and twisting. Doubled yarn or thread is used in some sorts of weaving, espe cially in that called bobbin net, but its principal use is for sewing. When manufactured for this purpose it is specifically known as sewing thread. A large proportion of sewing thread is simply doubled yarn and the processes 3f yarn doubling and of the manufacture of sew ing thread are substantially the same, but thread for sewing purposes often requires to be stronger and firmer in texture than doubled yarn and then three, four and six strands of yarn of fineness proportioned to the thickness of the thread required are used to produce it.
The manufacture of sewing thread in the United States is very extensive. The chief seat of the cotton thread manufacture in Scot land is Paisley; in England, Manchester. Linen thread is manufactured largely in Ireland. Cot ton was first used in the manufacture of sew ing thread at Pawtucket, R. I., by Samuel Salter in 1794. Flax had always been used everywher;, but as Mrs. Salter was spinning cotton she noticed the fineness of the fibre and at once conceived that it would make smooth thread. The idea was put into prac tice. The operation of "spinning' cotton is really making thread for weaving. A loose cotton called a "roving)" is drawn out into a filament or yarn and twisted and wound on bobbins that later go to the weaving machine. See COTTON MANUFACTURES IN THE UNITED STATES.