In weaving, as in spinning, however advanced, complicated and improved the means may be beyond the hand methods and simple looms of past ages, the general principles in the process are still the same. These means, generally and broadly speaking, consist of a frame for two sets of threads, a roller, called the warp beam, for receiving and holding the threads which form the warp, a cloth beam upon which the cloth is wound as it is woven, the warp threads, being first laid parallel, carried from the warp beam and attached to the cloth beam; means called heddles, which with their moving frames constitute “a harness,” consisting of a set of vertical strings or rods having central loops through which the threads are passed, two or more sets of which receive alternate threads, and by the reciprocation of which the threads are separated into sets, _decussated_, forming between them what is called a shed through which the shuttle is thrown; means for throwing the shuttle; and means, called the batten, lay or lathe, for forcing or packing the weft tight into the angle formed by the opened warp and so rendering the fabric tight and compact, and then the motive power for turning the cloth beam and winding the cloth as fast as completed. It is along these lines that the inventors have wrought their marvellous changes from hand to power looms. Prior to 1800, in the weaving of figures into cloths, it was customary to employ boys to pull the cords in the loom harness in order to arrange the coloured threads in their relative positions. In that year appeared at the front Joseph Marie Jacquard, a French mechanician and native of Lyons, whose parents were weavers, a prolific inventor in his youth, a wayward wanderer after fortune and a wife, a soldier in the Revolution, losing a son fighting by his side, eking out a poor living with his wife’s help at straw weaving, finally employed by a silk manufacturer, and while thus engaged, producing that loom which has ever since been known by his name. This loom was personally inspected by Napoleon, who rewarded the inventor with honours and a pension. It was then demolished by a mob and its inventor reviled, but it afterward became the pride of Lyons and the means of its renown and wealth in the weaving of silks of rich designs.