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Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
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nd it has several modifications, such as bow-pen, bow-pencil, beam-compass, etc. Compasses for measuring and transferring measurements are called dividers, bisecting-compass, proportional compass, etc. See compass. Draw′ing—frame. 1. A machine in which the slivers of cotton or other wool from the carding-machine are attenuated by passing through consecutive pairs of rollers, each successive pair rotating at a higher speed than its predecessors. The device was first invented by Leon Paul, patented 1738; and perfected by Arkwright, patent 1769. It was called a water-frame, from the circumstance that Arkwright's machinery was driven by water-power. It was named a throstle from the brisk singing or humming sound made by it. See throstle. It is used in the process of doubling slivers (see doubler), and is indispensable in the bobbin-andfly machine and the mule (which see). The drawing-frame, disconnected with any spinning operation, is a machine to elongate the sp
of a halter that encircles the horse's throat; also called jaw strap. Throe. A tool for splitting balks of timber into shingles or clapboards. A frow. Thros′tle. 1. (Cotton.) The drawing-frame of the cotton manufacture. The great invention which succeeded the spinning-jenny of Hargreaves. The drawing-frame is for attenuating slivers of fiber by passing them through consecutive pairs of rollers, each pair in the succession revolving at a higher speed than its predecessor. Leon Paul, by patent of 1738, claimed a mode of spinning by rollers, but the device did not come into use. (See spinning.) Richard Arkwright perfected the invention and patented it in 1769. Arkwright's original spinning-frame was fed with rovings which passed between three pairs of rollers of successively increasing speed. The yarns were wound upon bobbins by means of flyers. It was the culmination of several attempts, and possesses the main features of the throstle and the bobbin and flyframe