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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MAGIC LANTERN WITH DIRECT CURRENT [Cn. I FIG. 15. LANTERN SLIDE IN PERMANENT WOODEN CARRIER; ONE-HALF SIZE. / Face view of the carrier and its slide. 2 Sectional view of the carrier, showing the shelf on which the slide rests, and the wire spring above. The slide is usually cut in circular form, and fitted into a circular opening in the frame. A hole of the desired size is first made in the middle of the carrier, but not going clear through ; then a slightly smaller hole goes entirely through. This leaves a narrow shelf for supporting the slide. Above the slide is placed a cover-glass, and then a wire spring to hold the glass in position. PROJECTION OF HORIZONTAL OBJECTS ยง 42. The ordinary magic lantern is in a horizontal position (fig. i), but the lantern slide must then be vertical. Objects in liquids, and some other objects cannot be put in a vertical position, hence the necessity of a rearrangement of the lantern parts so that the object may be placed horizontally. This is accomplished by placing the second or terminal part of the condenser, in a horizontal position, and the projection objective is made vertical. By means of a plane mirror in the path of the beam of light from the first part of the condenser, the light is reflected vertically upward. The object is placed horizontally just above the second element of the condenser. The vertical projection objective would give a picture