Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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CH. I] MAGIC LANTERN WITH DIRECT CURRENT 33 on the ceiling above, but by means of another mirror at 45 degrees or a prism this vertically directed light is reflected horizontally to the ordinary vertical screen (fig. 16, § 4aa). (For projection with the vertical microscope see § 397). FIG. 1 6. ARRANGEMENT OF THE MAGIC LANTERN FOR HORIZONTAL OBJECTS. (Cut loaned by C. H. Stoelting Co.). Commencing at the left the parts are : L Hand-feed lamp with right-angled carbons. H Lamp -house cut away to show the lamp within. / 2 Adjusting screws to move the carbons, j 4 Screws for centering the crater. 5 Adjusting screw for moving the lamp toward and from the condenser. C The plano-convex lens of the condenser next the radiant. It here gives a parallel beam. T Water-cell in the path of the parallel beam. § 42a. In England and America this is often called vertical projection from the position of the objective; in Germany it is called horizontal projection from the position of the object.