Dust chamber efficiency generaly repressented by the weight ratio of precipitated dust and total dust flow into dust chamber. The examination performed to asuring the uncertainty of experiment, reported in second article, subjected to this efficiency finding method. On measurement of total dust and residual dust generaly apply a gas extraction method, but here under several assumptions chose a calculation method. But this calculation method has a week point that any assumption be not proper, the results become unreliable, the results checked by chemical contents of dust which related to fineness of dust. Of course fineness of precipitated dust directly may not indicate a said efficiency but it is evident that more the efficiency be rise, more the fine particle be settle, therefore if we know efficiency and fineness of precipitated dust of standard chamber, on the comparison of fineness of dust particle, we can find an efficiency of test chamber. I choose a cottrell for a standard chamber and utilize a relation, hold on fineness and chemical contents of dust, for finding of fineness of precipitated dust. These examinations, however, give no sufficient result, then I tryied a direct measurement of efficiency by using a small dust collecting apparatus and chancely I see followers;
1, Dust contents of branched flow generaly differ from dust contents of main flow.
2, On measurement of efficiency of dust chamber, if chamber treats a branched flow, measure may not repressents its said efficiency.

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