If I can get 5 lb of wool from my sheep (an Icelandic sheep produces 4-5 lb, a Lincoln produces 12-16 lb), and a pound of wool can produce 2,600 yards of lace-weight yarn or 900-1,200 of worsted weight, how many sheep would I need to produce a dress? How long would it take to spin up the thread?
Let’s assume I am using a warp-weighted loom, producing 48″ wide fabric, and I need 4 yards. To figure out how many threads per inch on my warp, I need to wrap the threads snugly around a ruler and count how many in an inch, then divide by two. Using the rather coarse thread I’m weaving right now (unplied) that gives me about 14 threads per inch for my weft. I’ll need some thread at the end where my weights are tied on. Lets assume one foot of wastage there (it could be more, as I haven’t actually seen how close you can get to the end).
14 x 48 = 672 warp threads
672 x 13 feet = 8,736 feet of thread required
8,736/1200 = 7.28 pounds of wool
Therefore, I need 1 1/2 sheep per dress. In a family of four, with an over tunic and under tunic, that means 12 sheep to produce one new outfit for each family member each year. That doesn’t count cloaks, hats, socks, etc.
In an evening (around 2 hours), I spin about 160 feet of wool. At that rate, it will take me
8736/160 = 54.6 evenings to spin enough wool for one dress. and 437 evenings to make enough for my family. Clearly, this is not something I can do just in the evening, if I am going to get enough thread to make these outfits in a year!
Obviously, my calculations leave out any time for cleaning the wool, preparing the loom and doing the actual weaving. Any other family chores (cooking, child care, farming) would be on top of this.
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