The first model had shown that the use of slits, even with the brightest light, could not result in a successful picture, according to Uchatius. (Illustration facing page 105.) He then constructed the improved model. The pictures (a), (a) ... are painted transparently and set upright in a circle as close together as possible on the wooden slide (A). In front of each picture is a projection lens (b), (b) ... which can be inclined towards the center of the apparatus by means of a hinge and set screw. The inclination of all the projection lenses is so adjusted that their optical axes intersect at the distance at which the picture appears (in other words on the screen). It follows there that all the pictures must appear at one and the same point on the wall, (W). The light source consists of a lime cylinder, (B) glowing in a stream of oxyhydrogen gas and the condensing lens, (C), which gives somewhat converging rays and illuminates only one picture at a time. The light is turned in a circle by a simple mechanism by means of a crank, (D), either rapidly or slowly as desired, (the first slow motion projector as well). During the movement the light source retains its upright position because of its own weight, since it is suspended from its support, (c), so as to be easily movable. The two rubber gas tubes rise and fall through the opened bottom of the cabinet. The lead weight, (E), serves as a counterweight to the light source. Uchatius was pleased with this machine. “The result is now evident. The successively illuminated pictures appear on the wall in the same way as the so-called dissolving views but much more rapidly, thereby causing the effect of a moving picture. The size of the picture is not limited by the slits and the sharpness is not affected since no motion of the object picture occurs.” In this manner Uchatius solved the problem of projecting these pre-film hand-painted motion pictures. In the very beginning of magic shadow projection Athanasius Kircher had sought the same results but did not have the apparatus or the knowledge of vision and movement necessary to carry out his wish. The lantern model of Zahn equipped with a revolving disk approximates the plan of Uchatius but failed, as did Kircher’s, and for the same reason. So far as Plateau was concerned, the illusion of moving images visible to one person at a time was sufficient. Anyway, the blind man--missing his own sight--probably did not feel impelled toward arranging simultaneous viewing for others. Doubtlessly he thought that to see motion pictures--one person at a time--was a sufficient marvel. Edison, more than half a century later, tended to the same opinion.