A method and apparatus for automatically measuring the distribution of reflectance of coals is given, which comprises the steps of vertically projecting light to samples of coals on a movable stage, allowing a photodetector to receive said light through a microscope as the stage moves, thereby measuring...http://www.google.fr/patents/US4030837?utm_source=gb-gplus-shareBrevet US4030837 - Method and apparatus for automatically measuring distribution of reflectance of coals
Method and apparatus for automatically measuring distribution of reflectance ...
