Can You Describe The Loom Used In Making Persian Rugs?

The loom is composed of two parallel beams, which are light or heavy depending on the weight of the material, and two crossbeams. The cotton warp threads are stretched between the upper and lower crossbeams. The closer the warp threads, the finer the carpet will be. Fastened on the upper warp beam hang the spools of multicolored yarn. The rug pattern is in front of the weavers, showing the design to be achieved knot after hand-tied knot.
Two basic weaves are used in fine quality carpets. One employs what is called the Sehna or Persian knot. This knot produces a close, fine, velvety surface. The other uses the Ghiordes or Turkish knot.
Once a row of knots is completed, the weft threads are passed along the width of the carpet. These are beaten down by a comb to give the fabric strength and firmness. The strands are then cut to carpet level.