Abstract
In accordance with regulating methods, the grain sorters are divided into four type: i. e. none, plain vertical and solid type. Furthermore, each are divided into two kinds: i. e. parallel and fanwise.
So, in conclusion, we must think eight kinds of sifting mechanism. In the fourth report, I suggested the sifting theory as regards to the ideal case, that is, parallel mechanism with plain regulating type. And now I confirmed that this theory come into existance of the eight cases as described above.
I have treated of the mechanism of only one grain, to tell the truth, however, a large quantity of grains are sifted at the same time. In this report, out of my theory, I should like to consider the statistical method to calculate the sifting ratio of grain which diameter is known. These method are as follows.
At the first, as described in the second report, calculated the efficiency of area ηx out of methematical treatment. Next, We must calculate the sifting efficiency ηs as regard to the condition belonging to the time in the theory, but this way is very troublesome.
For this reason, I thought of the monography by which ηs is simply calculate. I should like to call it “Miyoshi's Monography”. Thus the sifting ratio of grains is simply calculated from the formula η=ηsηa. As the result of numbers of experiments, it was proved that this statistical treatment is right and of practical use.
