this post was submitted on 05 Sep 2023
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Actually had a colleague who determined distances on microscopy images that way. She would measure the scale bar included in the image with her ruler on the screen, measure the distance she was interested in and calculate the distance using the rule of three. I mean, why bother using the measuring tool included in the software.
I've heard of people printing out charts, then cutting out the part they wanted to calculate an integral of, then weighing the paper.
I've heard of it too. You would need an analytical balance to get accurate measurements weighing a piece of paper. Just cut out the part you want to take an integral of, then cut out a piece of paper with known size (or cut several pieces with different sizes to get more accurate results) and weigh each of them. I guess this used to be cheaper and faster than using computers when computers were big and expensive.
Or maybe just a powder balance. When I was a kid in the 1960s, Dad did a lot of reloading his own ammunition. We kids had fun doing things like weighing our names (weigh a small piece of paper to get the tare, weigh again to get the loaded weight, subtract) and other miniscule things. As I recall, it was accurate to less than a grain (0.065 gram).
One of the things we did was weigh different shapes of paper to calculate area. Start with a sample of a unit area. Cut out a funky shape and weigh it, then do the math.
Nono that's genius
..ignoring the part that it's just a discrete approximation of an integral a la a Riemann sum.
How thick is your paper?
How inaccurate is your scale?
How precise are your scissors?
How funky is your chicken?
I was reading an old book about chromatography in laboratory and they exactly describe this method to determine the amount of substance.
That's pretty clever!
That was a common way to do it before computers were common.