I would say that the first knot it a barrel knot. It is also commonly used for the safety knot in a climbing system. Here is one attached to my water bottle. The one on my water bottle has fewer wraps but is the same knot. The second picture is two of them tied against each other on a rope to make a loop.
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The second knot in this thread is a larks head, a similar knot with more wraps is called a prusik. To tie this I used the loop from picture two. The first picture is before the knot was tightened and the second is after I pulled on the loop. This knot is great because when under tension it doesn't slip but when loosened it is easy to move a long the line. I have used this knot to hang a 1/2" x 350' steel zip line cable on a high ropes course and also to relieve strain on cable connectors.
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When using this knot for strain relief I usually tie the prusik on the cable below the connector, then tie the prusik loop off on a baton or something else near by that can take the pressure. I could take a picture of this if anyone wants to see. Does anyone think it's a bad idea if I am working with power cables? What about other kinds of cable? Obviously cable pressure should be avoided but I figure pressure like this is better than pressure on the connectors.
Interesting I haven't heard that one. As was mentioned above, I know it as a Lark's Head. I wonder if that's some sort of regional slang.i believe its called a cow hitch
And if it is done with webbing it then turns into a girth hitch, And if you pass it through two more times it then becomes a prussik...Here's a theory: if the knot is made by making a bight, passing over the pipe, then pulling the ends thru, it's a larks head. If it's made with a free end, it's a cow hitch (see Grog's Animated Knots). Wikipedia indicates that cow hitch came first, but I'd never heard it called that until today.
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