Let's dive into history.
Before there were machines and mills for spinning yarn, all yarn was handspun on spindles or (later) wheels.
Weavers need massive amounts of yarn. Depending on the modern mythology you follow, it was a ratio of 4 or 14 spinners per every one weaver. (long story, but the likelihood is with wool, the ratio is 4 to 1, with
linen it's closer to 8:1 if we include processing the fibre - which most people don't). Lots of different spinners all spinning slightly different yarn. But a weaver needs extremely consistent yarn. And if each yarn is different, how do you know how much to pay each spinner?
So you see, we've had this problem before.
Their solution was to create a standard length called a Hank. A hank (at that time in history - circa medieval Europe/England) was a set length of yarn. Each town's guild had its own length that they went by which was later nationally standardized depending on fibre content. I can't remember wool yardage off hand, but a hank of linen was 300yds. For some reason, my mind wants to say wool was 430yards per hank
A hank used to be a unit of measurement for yarn. These days we use it to mean a skein - aka, a large loop of organized yarn. Just like how gross used to mean a dozen dozen, and now it's just yucky.
The spinner would sell the wool by weight. If it was lightweight, it was finer (and better) yarn. Each spinner had his or her own history, so the weaver would know the quality and pay accordingly. Then the weaver would sort all the skeins of the same wight - knowing that these would all be the same thickness. Thus yarn thickness is called "weight".
(as a side note, proper finishing of yarn was common. Either the weaver would wash and block the yarn, or they would contract with the spinner to do that before selling. Thus finishing wasn't an issue - unlike today where most hand spinners have their own ideas of how to finish yarn, and many/most don't finish it at all. How the yarn is finished dramatically affects the weight
:length ratio.)
This worked really well when the yarn was being gathered in small regions. The areas within a day's horse ride of a town, for example. The sheep were of a consistent style for that area - the same style of wool, the same gene pool. The wool each of the spinners is using is the same!
However, not all wool is created equal. Cotswold vs Suffolk. Each individual Cotswold fibre is denser and longer than that of a Suffolk Sheep who has more crimp. Even processed and spun the same way, the yarns will be drastically different. Suffolk will trap more air and be more squishy. Cotswold denser and smoother.
At the same length, the Suffolk will weigh considerably less than Cotswold yarn.
As the canals system and later the railways were built, yarn trade within England and abroad became more common. Even standardizing the measurement of a Hank didn't do
enough to help the weavers know what thickness of yarn they were getting when they bought one hank. This is why different names for "weights" (thicknesses) of yarn started about this time (circa 1800s) as well as the more frequent usage of the YPP (yards per pound) system of describing yarn.
...
Industrialization.
When they first started making spinning mills, there were a few factors that limited the weight (thicknesses) of the yarn.
1. to make many thicknesses means more expensive and more complex machines - which break down faster and cost money to repair.
2. the weaving machines could only use a limited range of yarns.
3. Only certain kinds of wool (the down descendants) could be used on the spinning mills as the design is based on cotton which is more standardized than wool
4. some other factors that don't need exploring at this moment.
So here we are, using one 'family' of wool to make standardized yarn. We can go back to knowing that if a hank weighs suchandsuch, then the thickness is thusandthus and can be woven shuch-ly.
The yarn was made thicker by plying, rather than spinning thicker yarn. You can see this more strongly in modern-day weaving cotton sizes. 8/2 for example. It makes no sense unless you are steeped in industrial history.
Then as machines change and could spin a broader range of fibre types, we went back to having the not-all-wool-is-created-equal problem.
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Handspinners today
Some factors that are going to effect the weight (thickness) of the yarn vs, the YPP (yards per pound)
- spinning style
- fibre prep
- type of wool
- breed of wool
- finishing choices
Depending on the way these are done, we can have two yarns of the same thickness, the same length, and have one weigh half again as much as the other.
A database of what people are selling their yarn for would be a starting place, but it wouldn't tell us enough to know what people want to spend on handspun.
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Industrial wool buying/selling/prices.
I have my level one wool grading certificate. It takes about a dozen years to get to the top level. There are maybe a few dozen fully trained wool graders in North America. Who graded the wool will have a final effect on the price per pound the farmer gets.
At big farms (we're talking of more than 10,000 head of adult sheep), the wool is graded and sorted on site. You have A, B, C.... Z, and then numbers added to these. Complicated codes. You can have a dozen grades per farm. All yarn has value, even the shitty stuff I toss into the
compost here, would be sold at several pounds to the penny. Then the wool is compacted into bails and often core samples are taken from those bails and sent to a laboratory to make sure that the grade is consistent with international standards.
Each bail weighs between 125 to 200 kilo. The people buying wool are buying it by the hundreds or thousands of bails.
There are often wool brokerages and sorting houses (sometimes up to half a dozen) between the farm and the final customer. Each stage on the journey, adds a bit to the price. Everyone's got families to
feed.
These published prices may be what the farmer gets, or they may be what the buyer pays. It's important to look at that. More importantly, looking at the scale of the sales.
Handspinners - I can go through a fleece a week if I'm only spinning. That's 50 fleeces a year. Each fleece (of the kind I'm used to working with) weighs about 1-2 kilo. That's half a bail of wool. My volume is much lower, so my price is much higher. Most farmers here don't sell a fleece at less than $20. Some give them away. Some cost upwards of $300 depending on the quality. That's buying directly from the farmer. But the agricultural agencies don't deal with such small potatoes as that. The prices don't equate.
....
These are the difficulties the database would have to overcome.