Originally Posted by
GrizzlyAdams
with a note of caution on the accuracy of the scale used. I whack off 1 ft, and on a scale that is accurate to 0.5 grams (like mine) I come up with w grams. If w is large compared to 0.5, no problem. But if it is small, and I weigh a roll and it comes out at N grams, my error can be large.
To wit, if the true value is between w-0.5 grams and w+0.5 grams (depending on your definition of "accuracy to within 0.5, but just go with this), then if you weigh the roll and come up with N grams the true value is between
N/(w-0.5) and N/(w+0.5) ft. If w were, say 2 grams, the range is N/1.5 to N/2.5 feet, very roughly error on the order of 25%.
Not sure what a foot of grosgrain weighs, just used 2 g for illustration.
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