A McMorran balance is used to determine the yardage of an unknown yarn. The McMorran balance consists of a rectangular box and a balancing arm.
- Place the McMorran balance on a level surface, such as on the edge of a table.
- Set the pins of the small balancing arm into the small notches on the top of the box.
- Lay a length of yarn in the notch of the balance, allowing the yarn to hang down towards the floor.
- Using scissors start to trim the length of yarn, cutting x-about 1/2 inch at a time, until the balancing arm is level.
- When the arm is level, remove the length of yarn from the balance.
- Measure the length of yarn against a ruler.
- Multiply the measurement x 100.
- This measurement gives you the number of yards per lb. of yarn (ypp)
- e.g. 6 inches x 100 = 600 ypp
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