DETAILS TO BE OBSERVED. It is of great importance for each person looking at these stereographed places or scenes. First, To move the slide or carrier, which holds the view, to the point on the shaft of the stereoscope where the view can be seen most distinctly. Second, To see that the best light available falls on the face of the photograph. Third, To hold the stereoscope firmly against the forehead, excluding all surrounding light from the eyes. Fourth, Not to look
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