Catalog of stereopticons, motion picture machines, projection apparatus : manufactured and imported by the McIntosh Stereopticon Company . Path of Light in Ordinary Opaque Projection. Opaque projection cannot be satisfactorily accomplishedwith anything except the electric arc light, or the nitrogen-filled incandescent, and in the case of the latter the distanceand size of picture must be very limited. With a sim])le projecting microscope, the path of light isvery similar to that of regular lantern slide projection, exceptthat instead of going thru the projecting objective used forlantern slide
Catalog of stereopticons, motion picture machines, projection apparatus : manufactured and imported by the McIntosh Stereopticon Company . Path of Light in Ordinary Opaque Projection. Opaque projection cannot be satisfactorily accomplishedwith anything except the electric arc light, or the nitrogen-filled incandescent, and in the case of the latter the distanceand size of picture must be very limited. With a sim])le projecting microscope, the path of light isvery similar to that of regular lantern slide projection, exceptthat instead of going thru the projecting objective used forlantern slides it goes thru a microscoi)e objective, after firstpassing thru the slide of the regular microsco])e type andsize, mounted on a regular microscope stage, fine adjustmentor perfectly Path of Light in Simple Projecting Microscope. Any projecting microscope will take standard objectivesand will work very well with an objective up to one-sixth. The concentration of the rays of light on the small micro-scope slide and objective is such as to intensely heat it is essential to pass the rays through a coolingtank, or water cell, before they reach the microscope slide andafter the}^ leave the condensing lenses. This water cell and asimple projecting microscope are illustrated. 14 McINTOSH STERKOPTICON CO., CHICAGO, ILL., l\ S. A. In vertical projectionthe rays of light proceedthru the first condenser,just as they do in lan-tern slide projection, andare then reflected up bya mirror placed at anangle of 45 degrees to theoptical axis, so that theybecome perfectly this way objects whichmust be held in a hori-zontal position are madepossible of instance,magnetic linesof force, the ac-tion of oil, etc.,on the surfaceof water,Chlad-nis f
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