Needles


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Needles

 

small slender instruments widely used in sewing and knitting, medicine, printing, and other industries. There are needles for machine and hand sewing. Machine needles are usually cylindrical in form with a conical point; sometimes they have special points to cut openings in various shapes, including oval, rhomboid, triangular, and square (for leather, oilskin, and impregnated fabrics). Needles may be straight or bent. Some needles have a hook at the sharp end instead of an eye. They are manufactured in various sizes (0.25– 4.0 mm in diameter) and numbered accordingly: the numbering is based on needle diameter and expressed in hundredths of a millimeter (no. 60 is 0.60 mm in diameter, no. 120 is 1.20 mm). Hand needles are classified by number according to length and diameter—for example, no. 1 to no. 9 needles range in thickness from 0.6 to 1.0 mm and in length from 30 to 50 mm.

An engraving needle is a fine steel rod (like an ordinary sewing needle, but with a point shaped like a cone, a truncated cylinder, or a blade) set into a wooden handle. It is a basic tool in etching, drypoint engraving, and engraving on cardboard, and it is an auxiliary tool in lithography and mezzotinting.


Needles

 

the needlelike or scaly leaves of many coniferous trees and shrubs. Needles are well adapted to the unfavorable conditions of hot summers and cold winters. They are usually perennial, falling from the tree gradually. The epidermis has a thick cuticle; the stomata are submerged. The pulp consists of parenchymal cells with chlorophyll granules; in pines the cell walls form intracellular outgrowths and folds that increase the photosynthesizing surface of the leaf. In the center of each needle are one or two conducting bundles. The needles of many species contain resin canals. The needles discharge into the atmosphere special substances called phytoncides, which influence the composition of the atmospheric microflora. Fallen needles form a slowly decomposing forest floor. The needles of certain trees are used to obtain fir and other oils, vitamins, meal (pine, spruce), and plant fiber.

needles

Flying the aircraft strictly by reference to the needles on the navigation instruments.
References in periodicals archive ?
Shape gusset: Rejoin for working in the md as foil: Set-up rnd With RS facing and using heel needle (Needle 1), pick up and knit 17 sts along side of heel flap; with Needle 2, work 31 held instep sts as k5, work Rnd 1 of Lace chart over next 21 sts, k5; with Needle 3, pick up and knit 17 sts along side of heel flap, then knit first 9 sts from Needle 1 onto end of Needle 3--83 sts total: 26 sole sts each on Needles 1 and 3, and 31 instep sts on Needle 2.
Naturally as stroke length is decreased or penetration depth and web thickness are increased, the proportion of time increases during which the needles are interacting with the web.
Cocaine injectors are in even more jeopardy than heroin addicts because they tend to shoot up more frequently and are more likely to share needles.
Measures for Checking Needlestick Injuries II-15 Prevention of Needle Stick Injuries II-15 Use of Safety Devices II-15 Safety Connection Systems II-16 Port Primers - An Important Part In Safety Connection Systems II-16 Types of Safety Connection Systems II-16 Protected Needles Connected to a Standard Injection Port II-16 Blunt Plastic Cannula Connected to a Pre-slit Port II-16 Male Leur Tip with Leur-Activated Valve II-16 One-Piece, Swabable Leur-Activated Valve II-16
All needles have basically the same parts, but the shapes and lengths of these various parts are what make each needle different.
However, expanding use of surgical staples instead of needles and suture can deter the demand for cardiovascular needles.
When I set out to learn more, I was thrilled to take a class about Schmetz needles from Rhonda Pierce at the International Quilt Market in Houston, Texas.
The Automatic Needle Exchanger can be universally used for all practicable applications required from our customers and does not only cover inserting needles into new needle boards.
Such 'echogenic' needles would likely improve the safety and success of ultrasound-guided neural blockade.