ブリ落網の改良に関する研究(1)-中層落網の模型実験について-

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The yellow-tail set-ting net get the large amount of resistance of currents, and for this reason much amount of gear and material of fishing was used, moreover the number of laborers increased. For the pourpose of this imployment, authors designed the mid-layer trap net, and studied on this model experiment In this experiment they obtained the following results.1. The form of net varied accordance with the direction and speed of current. (of. fig. 2,3,4. table 5,6,7.).2. The limit of first slipping of sandbags decided by the buoyancy, sinlking power, and fixing power. (of. table 8.). Now, they wish to study the resistance of current occuring by the variations of buoyancy.