Light-Figure Microscope and Its Crystallographic Applications

“Light-Figure Microscope” has been newly devised for determining orientations of crystal grains of microscopic size rapidly, accurately and perfectly. The microscope consists of two main parts: one is an optical system which produces a clear-cut light figure in the viewing field of the microscope, and the other a goniometric mechanism which measures the orientation angles. Full accounts are given of the construction of microscope, the principle, procedure and accuracy of the orientation determination with actual examples. It can be applid to crystal grains having the smallest diameter of 15∼25μ as well as to large single crystals with an accuracy well within ±0.2°∼0.5°. It can also serve as an usual metallurgical microscope.