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Typically, materials used for pattern making are wood, metal or plastics. Wax and Plaster of Paris are also used, but only for specialized applications. Sugar pine wood is the most commonly used material for patterns, primarily because it is soft, light, and easy to work.
The warp threads that form the braid are wound around weighted bobbins called tama (lit. ' egg '). [1] Tama were once made of clay [when?], but now are most commonly wood filled with lead. The weight of the tama maintains even tension on the warp threads, and is balanced by a bag of counterweights called omori [1] that is attached to the base ...
This shield is usually covered by an outermost layer of the cable. Common types of cable shielding can most broadly be categorized as foil type (often utilizing a metallised film), contraspiralling wire strands (braided or unbraided) or both. [2] A longitudinal wire may be necessary with dielectric spiral foils to short out each turn. [1]
A braid. A braid (also referred to as a plait; / p l æ t /) is a complex structure or pattern formed by interlacing three or more strands of flexible material such as textile yarns, wire, or hair. [1] The simplest and most common version is a flat, solid, three-stranded structure.
This type of shielding helps prevent EMI from entering or exiting individual pairs and also protects neighboring pairs from crosstalk. Overall shield (F/UTP, S/UTP, and SF/UTP): Overall foil, braided shield or braiding with foil across all of the pairs within the 100 ohm twisted pair cable. Common names: foiled twisted pair, shielded twisted ...
The shield might be just two braids, but it is more common now to have a thin foil shield covered by a wire braid. Some cables may invest in more than two shield layers, such as "quad-shield", which uses four alternating layers of foil and braid. Other shield designs sacrifice flexibility for better performance; some shields are a solid metal tube.
Bobbin lace may be made with coarse or fine threads. Traditionally it was made with linen, silk, wool, or, later, cotton threads, or with precious metals. Bess of Hardwick bought red silk, gold, and silver thread for making "bone lace" in 1549, the earliest English reference to this kind of work. [13]
1925 braiding machine in action The smallest braiding machine consists of two horn gears and three bobbins. This produces a flat, 3-strand braid. A braiding machine is a device that interlaces three or more strands of yarn or wire to create a variety of materials, including rope, reinforced hose, covered power cords, and some types of lace.