B. the balance scale and a standard of mass: Terrestrial measurement
Our scientist can also use a set of object of known mass, and measure their relative weights using a balace scale (rather than a spring scale). They find that , to a part in 1033 , W (from statics) and m (from dynamics, using a force other than gravity) are proportional, independent of the specific values of W and m, and the proportionality is independent of the material studied , although the ratio W/m may vary from locale to locale.