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

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176 PROJECTION OF IMAGES OF OPAQUE OBJECTS [Cn. VII FIG. 95. ZEISS EPIDIASCOPE FOR OPAQUE AND FOR TRANSPARENT OBJECTS IN A HORIZONTAL POSITION. (Zeiss' Special Catalogue). As shown in this figure the apparatus is set up for opaque objects. For transparent objects M2 (mirror 2) is removed when the light striking M3 is reflected to M4 and thence up through the object to M1 and to the screen. Commencing at the right: R Parabolic reflector, which projects the light from the crater through (W) the water-cell to M1 the mirror which is at the proper angle for reflecting the light down upon the opaque object. From the opaque object the light is irregularly reflected through the objective to M1. M1 serves to reflect the rays from the objective to the screen. V Ventilator. M3 and M4 are mirrors for use in reflecting the light through horizontal transparent objects.