17G contained therein ; and would he adopted , in the first instance , in hot weather , on the failure of the ventilation produced by natural causes . The theory of the action is as follows : — … sequence , that of every cubic foot of air contained in the mine , if the areas are uniform , will theoretically be 8 n rji . Since , then , upon f b the theoretical velocity depends , it may be termed the motive column , in order to find which the following data are necessary : — h — the height of…
Bergbautechnik
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