8.1.2 Make several runs of a minute or two each, using
different total tuning weights, G, Fig. 1, and plot the total
tuning mass versus the amplitude of vibration to the nearest 0.5
mm (0.02 in.). At low values of mass the amplitude will be
very small, increasing to higher values as proper tuning is
reached by the addition of more weights. Further addition of
mass will then result in a decrease of amplitude.