Mathematics and Cast Net Making Case Study : Bandon Bay

Abstract

The objectives of this research were to study cast net making of Bandon Bay people and to investigate some mathematical relations of about cast nets. A target group consisted of cast net twenty makers were chosen from 5 sub - districts; i.e., Bangbaimai, Bangsi, Bangpho, Klongchanak and Lilet in Suratthani Province (four makers : one sub - district). The study results are that makers almost make cast nets by partial hand sewing and the making method can be shown as follow: the first step, to make the first component of a cast net, they cut a net to meshes and fasten one edge of the net (like a cone) called a head of a cast net. Next to make the second component of a cast net, they cut a net to meshes and attach it to the edge of the first component by hand sewing. The third component is a mesh net which connect to the edge of the second component. Inductively, this process can be extended to the n^th component. Finally, to make the last component, they attach circular steels to the edge of this component for fast sinking of a cast net and create the bags for fish caught in it. Then we have a relation between componentsand meshes of edge of a cast net (a_n) and total meshes of a cast netas follow these equation.   

a_n  = 70n  and .