A glass frame that is placed on the wooden frame, inside it there is a little frame covered by sponge, with two hinges at the lower parts of the little frame.
A glass frame that is placed on the wooden frame, inside it there is a little frame covered by sponge, with two hinges at the lower parts of the little frame.
木座上置有一个大玻璃框架，玻璃框架中央有一个被海棉遮掩著的小窗，小窗下有铰位。