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The Birmingham gauge, [1] officially the Birmingham Wire Gauge and often abbreviated as G or ga, [2] is unit or wire gauge used to measure the thickness or diameter of wires and tubing, including hypodermic needles and other medical tube products.
However, the term gauge, abbreviated G or ga, typically refers to the Birmingham gauge for hypodermic needles. [1] The French scale measures and is proportional to the outer diameter of a catheter, with 1 French (Fr) defined as 1 ⁄ 3 millimeter, making the relationship: 1 mm = 3 Fr.
Dimensional properties include thickness, gap in space, diameter of materials. [1] [2] Basic types ... An indicator or needle indicates the measurement on the gauge ...
Gauge (firearms) Wire gauge, a measure of the size of a wire American wire gauge, a common measure of nonferrous wire diameter, especially electrical; Birmingham gauge, a measure of ferrous wire and hypodermic needle diameter; Jewelry wire gauge, the size of wire used in jewelry making; Sheet metal gauge, thickness of metal in sheet form
Various needle lengths are available for any given gauge. Needles in common medical use range from 7 gauge (the largest) to 34 (the smallest). 21-gauge needles are most commonly used for drawing blood for testing purposes, and 16- or 17-gauge needles are most commonly used for blood donation, as the larger luminal cross-sectional area results ...
A more hands-on method, there is the test swatch and the gauge swatch. Knitting a test swatch requires knitting the yarn into a small, roughly 4 in (10 cm) square textile of even stitches. [4] Comparing this with recommended needle sizes, yarn, and the knitter's own signature tension, allows for adjustments to all of these things.
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