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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TROUBLES IN OPAQUE PROJECTION [CH. VII FIG. in. DIAGRAM OF MODEL 8 DELIKEASCOPE SHOWING THE POSITION OF THE RADIANT AND THE COURSE OF THE LIGHT RAYS FOR OPAQUE PROJECTION WITH THE OBJECT IN A HORIZONTAL POSITION. (Cut loaned by the Spencer Lens Co.). T Table for opaque objects. W Wheel by which the table is raised and lowered. D Diaphragm above the table for flattening out the page of a book. B Incandescent bulb which always gives light for the interior of the machine. C Condensing lenses in front of the arc. O Large objective for opaque projection. ()1 Smaller objective for vertical projection. ,]/ Mirror for throwing light downward for the lantern-slide compartment or upward through the vertical attachment. -If, Mirror for reflecting a perpendicular beam of light out through the lantern-slide compartment; shown thrown up against the water-cell in this figure (see fig. 177) M3 Mirror used in connection with projection of the vertical side of an object. M^ Mirror which assumes a position at 45° when the microscope is used perpendicularly. P Prism which is thrown into the prism box when the microscope is used in a perpendicular position. S Shelf upon which the lantern slide is placed previous to throwing it up into the optical axis by the handle. // Handle of the lever for raising the slide into position.