Why is it important to measure accurately?. Measuring in English (American Standard System). Using a Ruler. Where did it come from?. Why 12 inches?. The King’s Foot. One Foot. The King’s Foot. One Foot. Too big for some things. ...So they used the length of the King’s first knuckle.
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Using a Ruler
Why 12 inches?
Too big for some things...
But that was too big for some other things...
Simply because it took 12 lengths of his first knuckle to equal his foot.