The orthodox type of loom for weaving cotton, wool and other fibres is a relatively primitive device which, despite many efforts, has long resisted fundamental improvements. Some of its highly stressed parts are made of wood, leather and other materials subject to rapid wear which results in the need for frequent adjustment and replacement of parts and difficulties in maintaining uniformity in the product. The vital part of the mechanism is the shuttle which travels across the loom inserting transversely threads one at a time (the weft) between two sets of longitudinal threads (the warp) held apart to allow the passage of the weft. In the orthodox machine the shuttle carries its own thread internally; it has therefore to be as large as possible but, even at its maximum practicable size, it can carry only a limited supply of weft. The shuttle, therefore, has to be replenished frequently; its movement is difficult to control, and if, as sometimes happens, it is ejected from the machine, it may be dangerous. Further, the shuttle has a discontinuous movement; it is hurled across the loom at speed and then brought to rest suddenly. This uses up energy and creates a great deal of noise.