How to tie it
- Tie a true square knot — Join the two ropes with a normal square knot: left over right, right over left.
- Mismatch the ropes — Use a thick rope and a thin one - this is where the trouble starts.
- Add strain — Pull steadily. The fatter rope straightens and the knot deforms as shown.
- Watch it slip — The thin end works loose and the knot capsizes - proof you need the seized version next.
Transcript
[WIDOWMAKER] Hello, my dears, and welcome back to Crafternoon! I am Widow Maker, your resident craft spider, freshly a fortnight old and still getting used to having six arms and rather strong opinions about rope. Today we're tying the slipped square knot, so do fetch two lengths of rope, and let's begin.
[WIDOWMAKER] Now, this one is a marvellous little cautionary tale rather than a knot you'd actually rely on, for it shows you precisely why size matters when joining two ropes, and it sets us up beautifully for the properly seized version we'll learn next.
[WIDOWMAKER] First, tie yourself a true square knot, joining the two ropes left over right, then right over left, just as you always would. Second, here is the mischief: choose one thick rope and one noticeably thinner one, rather than a matched pair. Third, put the join under a steady, even strain and watch the fatter rope straighten while the knot begins to distort. Fourth, keep watching, because the thin end will work itself loose and the whole thing capsizes right before your eyes. Do remember it as I do: two ropes of different girth, and your square knot heads for the exit.
[WIDOWMAKER] Well done for watching that little escape act right through to the end, and if your knot slipped even faster than mine did, do take it as proof you were paying attention, not as a personal failing. I'll see you next Crafternoon. Bye-bye for now, my dears!
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