Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

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676 OPTIC PROJECTION Projection instruments of the third class can be properly divided into three groups: i, the Magic Lantern; 2, the Projection Microscope, and 3, the Moving Picture Machine. 1. The Magic Lantern It is not certainly known who first produced a workable magic lantern. The first figure and description we have found is the one of a Danish mathematician (Walgensten). The figure and description occur in the mathematical treatise of Milliet de Chales (1674), where it states that "in the year 1665 there came to Lyons a learned Dane well versed in dioptrics. Among other things he exhibited a magic lantern. . . In the first place the greater the distance dldlt8 FIG. 404. THE MAGIC LANTERN OF KIRCHER. (From the Ars Lucis et Umbrae, 1671, p. 768} The lamp is a naked flame with a concave reflector behind it. The lantern slide is a long strip with many pictures which can be shown one after the other. The lantern slide appears at the wrong end of the projection objective, making it difficult to see how any image could be projected. At the bottom of the picture is a part of the text in which the better form of Walgensten '& lantern is conceded.