Sentence Examples


  • Thus a monochromatic image of the sun is built up on the fixed photographic plate.
  • Suppose a fixed image of the sun to be formed on the collimator slit of this spectroscope, and a photographic plate, with its plane parallel to the plane of the solar image, to be mounted almost in contact with the camera slit.
  • The telescope serves to examine the image of the slit and to measure the angular separation of the different slit images; when photographic methods are employed the telescope is replaced by a camera.
  • In importance next to visual observation, and in the opinion of some, surpassing it, is the photographic method.
  • Schumann 2 have shown, however, that with the help of spectroscopes void of air and specially prepared photographic plates, spectra can be registered as far down as lzoo A.
 

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