抄録
In Yokohama many companies exported raw silk at the end of 19^<th> c. In the beginning of 20^<th> c. some trading companies had the shading equipments that putted in the window for testing the quality of the raw silk. That equipment was invented for testing the great deal raw silk hi 1901 when the national institute for testing the raw silk was enlarged. After that the equipment prevailed to the trading companies. In Yokohama at the end of 19^<th> c. the tea trading companies used the similar equipment called "HIYOKE" for testing the quality of the tea. The equipments for the raw silk followed ones for the tea.
