s are usually combined for acondenser in the magic lantern, are used. The light is re-flected from the mirror, R, through one of these lenses, C,used as a condenser. The other lens, 0, is placed a littleoutside the focus of the condenser, at such a distance thatthe light is again converged and… … from the lens, this disk can be utilized to the diameter ofthirty feet or more for this experiment. Now bring a pieceof wire gauze to the place marked E, not in the focus for or-dinary projection. The meshes will not be distinct, but eachone will be represented by the prismatic colors, so as to…
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