I have reposted these articles by Ms Premise-Conclusion on my blog because I thought this was a wonderful piece of technical work. The formula is so useful and well explained, making the principle easy to understand.
If you visit the website you can download template patterns for ‘ideal’ crochet spheres, squares and rectangles. These don’t do all the maths for you, but give you the tools to create the shapes in your chosen yarn and hook size.
A little while ago, I got a comment on my Ideal Crochet Sphere post, requesting a pattern for a giant crochet sphere. Too cool! It’s taken me a while to get around to calculating the number of rows required (especially since I had to extrapolate the size based on smaller spheres that I’ve made), but I think this will work.
So, here are the patterns for 60 row (~10 inch) and 85 row (~15 inch) spheres.
Since there are so many rows, I haven’t included how to space the increases nicely for each row, so I’ll leave that up to you, should you attempt it. For each row, I’ve written it as follows:
Row i: Increase by N (X stitches total)
So, for Row i, you have to work N increases as evenly as possibly into the row so that after you’ve completed the row, you will have X stitches…
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Vikki Haffenden 