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

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36 MAGIC LANTERN WITH DIRECT CURRENT [Cn. I upon the screen at the same time. For example, to show falling snow, in one of the lanterns is a slide showing a landscape, city street, etc.. in another is a black band with irregular perforations of minute size which give the appearance of snow-flakes. If now the light in the lanterns is properly regulated, and the black perforated band is moved up over the face of the condenser, the snow-flakes will appear to fall either gently or rapidly in the landscape or street as one moves the band slowly or rapidly. One can give the appearance of a driving storm by tilting the black band, for this will make the flakes seem to fall obliquely. For rain effects the black band should have slit-like perforations. MOVING SLIDES FOR SINGLE LANTERNS § 47. "Effects" with single lanterns. — The appearance of movement may also be produced in a single lantern. For this two slides must be superposed, and one moved over the other. By this means various combinations of designs may be made, and also appearances of relative movement. Here, naturally, the two slides must be close together, or one will be too much out of focus. Special slide carriers are constructed for showing these singlelantern "effects." For simple experiments use a single slide-carrier. The slides should have no cover-glass, but may be varnished. Then one slide is put in place as for an ordinary exhibition, and another is inserted over it and pushed by the fingers into different positions to show various combinations. For this experiment the bellows between the slide-carrier and the objective should be removed to give freedom to the hands in making the various changes necessary. § 48. "Slip-slides" for optical deceptions. — Slides with lines at various angles, etc., are used to demonstrate these. The lines can be shown separately, and then by pushing one slide over the other one can get various combinations. For suggestions as to slides the reader is referred to works on physiology and experimental psychology under "optical deceptions." § 49. Most of the "effects" produced by the movement of two slides over each other, and the use of multiple lanterns are so far