鮭鱒流網の張力測定-I

概要

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The measurements of tension on the salmon drift net were carried out by the strain gauge and these were mainly done on the net in still water. The results obtained are as follows; 1) Schematic deagram to show the distribution of tension is shown in Fig. 1. At the points nearer to both the head and the foot margins of the net, ununiformity of tension becomes more evident, while at the points nearer to the middle part of the net it is gradually equalized. The values of ununiform tension are 55-0g. at the head part of the net, 92-0g. at the foot, and equalized tension is 15g. The extent of equalized tension is between 1/6 line and 2/3 of the net from the head. 2) When the weight of lead increases at the lead line, the ununiformity of tension at both the head and the foot parts appears more remarkably but the extert of equalized tension is of the same area in the case of 1) 3) The tension on the hanging lines (Tsuriito) is nearly 130g. in usual, but when the lead line is pulled, the tension remarkably increases as shown in Fig. 6.
公益社団法人日本水産学会の論文