Many other chemicals can be used, however, for making the fluorescing screen, such as the sulphides of calcium, barium and strontium. Edward W. Byrn.十九世纪发明进展.
It was quite a simple affair, and consisted of an observation tube with a lens, having in front of it a screen of fluorescing material, such as platino-cyanide of barium. Edward W. Byrn.十九世纪发明进展.
Such fluorescing materials are spread in a thin layer on the side of the screen next to the observer in the viewing apparatus. Edward W. Byrn.十九世纪发明进展.
To determine this the fluorescing screen and grating are placed under the patient, and the X-Ray tube above, and the vertical line of the object is thus obtained. Edward W. Byrn.十九世纪发明进展.