在显微镜的载物台上加一个辅助装置，可便于视野寻找。用剪刀剪取比通光孔稍大的正方形的投影胶片，在正中画出和通光孔同样大小的圆，在圆心画出与该显微镜最大放大倍数时的观野同样大小的同心圆，并把它挖去。然后，将该胶片对准通光孔贴在载物台上。使用时，将显微玻片标本 Add an auxiliary device on the stage of the microscope to facilitate the visual field. Use a pair of scissors to cut the square transparence film that is slightly larger than the clear aperture, draw a circle of the same size as the aperture in the center, and draw the same size concentric circles in the center of the circle as the microscope’s maximum magnification. Dig it up. Then, align the film to the light hole and place it on the stage. When used, the microscope slide specimen