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weight Scale

I was building an airplane. i put 5 cannons, i needed to know how much weight i have to apply why the ballast. tHere was a problem: how much do 5 cannons weight? So i did this very simple machine. Maybe is not 100% accurate, but it help you a little bit.
P.S.:please place the objects of the 1° weighing plathe at the same distance of the other one.