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I think there are too many variables in the experiment. Tension on the line, pressure on the brick, length of stroke across brick, how the line will act after it has been used & exposed to the elements, etc.
I think simple pull tests are the most conclusive. With a nail at one end & scale on the other, slow steady pressure, w/ an assigned scale watcher to read the numbers. & use knots that are near 100%. Or whatever connection you will be using for the line in question.
I learned alot with this method
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