| 摘要 |
In an autocollimator two systems of scale marks are projected by the autocollimator objective into infinity. With regard to their image-forming properties both systems are complementary to each other, preferably they are tinted in complementary colors, or are polarized in directions normal to each other. The images of the scale marks are reflected by a reference and a measuring mirror. Both mirrors reflect said images back through the objective into the image plane of the ocular where in the case of complementary colors owing to the additive color mixture only one scale mark will appear white. |
