I took a 13' piece of the NER throwline (zing it would work great, too). I spliced an eye one one end. This is the "zero-eye" mark. Then I tied an over hand knot 3.14159 down the rope. This comes to 37 11/16ths of an inch.
I went down another 37+ inches and tied a double overhand. Went...
I was in the mountains yesterday checking out trees. I wanted to know the DBH, but had to tape on me. I can guess close enough (I think) but I wanted exacter numbers.
Rather than hauling around a measuring tape, I came up with this:
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