If the relative deviation is negative (i.e. the recorded intensity is less than the actual), it
originates from the water loss during the tipping time. In the range of high intensities,
during the bucket movement drops additional rain water in the bucket and in this way the
measured volume of water becomes more than the nominal bucket volume. In case of
larger buckets, the specific loss is lower than otherwise, therefore the greater buckets show
lower relative deviation at extreme intensities. The adhesive reserved water in this range is
negligible in comparison to the water loss.