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After the development of the negatives comes the printing. The printing requires even more care than the development of the films. If the films have been stretched or if the pictures are not kept at exactly the same distance apart in printing, the pictures, when thrown on the screen, will have that trembling motion and blurred appearance which is so disagreeable and so hard on the eyes. Figure 8 shows a Cinematograph machine printing positives on a film R. The negative is wound on the upper spool. The film passes into a box. This box is a "dark room" that admits light only at the point where the two films pass. As they pass this little window the picture on the negative film is printed on the positive film, just as the sun prints photographs exposed in a frame. Figure 9 shows another view of the same kind of machine.