Abstract
In this report 182 elementary school girls were divided into two groups by their thumb-lengths and sewing needles of three different lengths were tested by these two groups in order to find the most effective length of the needle.
The sewing efficiency was evaluated by the length of cloth sewed in a certain period of time, number of stitches and their uniformity.
It has been disclosed that the most suitable length of the needle is 64±4% of the thumblength for elementary school girls to increase the number of stitches and the length of cloth sewed in a given time.
So far as the improvement of the uniformity of stitches is concerned, a needle a little longer than that mentioned above, in other words 68+5% of the thumb-length, has been proved to be most suitable.
