ソコビキアミ ノ セッケイ ニ カンスル リャクサンシキ I

Concerning the shape of the net mouth of the trawl net a theoretical equation applicable to the measuring of the net mouth central height (N. C. H.) was noted after, basing on the following two the hypothesis : - (1) The net mouth is of the elliptical shape. (2) The perimeter of ellipse is unvarying, irrespective of the towing speed and the interval between the wing ends. and we have the following theoretical equation, given; namely [the formula is omitted] This theoretical equation value in the figure ascertained to be lower, at the low speed side, than the model experimental value, and conversely this was higher, at the high speed side, than the model experimental value. At the same time, it was ascertained that when the towing speed approached to 1m/sec the theoretical value approximately agreed with the experimental value