Note: round needles are almost always called circular knitting needles.
In some cases, circular needles will work just as well as double pointed needles. But more often than not, only double pointed needles will work.
Why? With double pointed needles, one can knit with as few stitches as they want. This makes them ideal for knitting the tops of hats, which are decreased to a very few number of stitches, and other items where few stitches are knitted. However, if one is knitting with a large number of stitches, then circular needles will work fine, maybe even better, but circular needles have a "minimum stitch limit." Thus, they only work if the pattern works with lots of stitches.
So in order to figure out whether circular knitting needles will work for your pattern, read through the instructions, and determine the point at which there will be the least number of stitches on the double pointed needles. Try to estimate the lowest number of stitches that will work comfortably on the circular needles, and decide if the stitches in the pattern will fit on the circular needles.
Double pointed needles have been used for centuries by knitters. The exact origin of the double pointed needle is not clear, but they have been used in traditional knitting techniques around the world for a long time. They are likely to have evolved as a practical solution for knitting in the round and creating seamless garments.
You can if you seam up the side and it it is a great thing to do for beginners when you have the right pattern, which is the difficult part. Alternatively, if you do not wish to use circular needles you can use DPNs (double pointed needles) to knit in the round. Often in hat patterns which use circular needles you will need DPNs anyway, so it is good to have some of these when you knit in the round.
Yes they are round.
year round
The three types of needle points are: ballpoint, sharp needles, and wedge needles. Each of these needles affect fabrics differently. Use ball points for knit fabrics, sharp needles for woven fabrics and wedge needles for vinyl and leather fabrics.
Depends on the gun. Some are sharply pointed.
Tattoo needles do not "turn around", tattoo machines repeatedly pierce the skin with ink. Different needles are used for coloring, and outlining. The Needles used for outlining are thinner than the needles used for coloring.
Cone
cone
You place the loop of the needle over the armature bar coupling. This will be held in place with either a disposable rubber hat, or with a piece of paper towel to firmly hold the needle in place and to ensure that there is no play with the needle, which is to say that it will be loose and the needle with rattle around the armature bar coupling and it will make your line work and coloring look erratic. You will set the the bar so that the needles are on the bottom of the bar riding against the tube, not the other way around. Needles straight out of the pack are completely straight, and you will need to bend the bar of the needle a bit to make sure that the needles are completely against the tube. You will then wrap rubber bands around the machine and over the needle bar to make sure that the entirety of the needle is snug and moving around. This is something that you should know well before you ever tattoo a person, so play around on your own legs to get the feel of tattooing before you ever mark another person. Best of luck.
Evergreen conifers hold needles all year round and gradually lose the old ones throughout the year. As the young needles grow constantly this needle drop is not noticible. Larch, Metasequoia and Ginko are deciduous.
Just as when you change needle sizes using straight needles to give the effect you want -- you can change needle sizes when working in the round, to give the effect you want.Doubling up two needles at the same time would give you a looser knit and could prove cumbersome.