8 is shown the method of projecting the glasses are bound to- persistence of vision. A card having several circles spectrum. The card shown above the lantern has a gether by means of of small perforations, say one-eighth inch, is cemented central longitudinal slit about three-sixteenths inch stout… … placing two wires in the tank, filled with acidulated A disk of perforat- FBOJECTINO TEE SFECTBUU. BEFSACTION. water (Fig. 24), 1^^ ed cardboard or tin and attaching a t^^f slit is focused on the screen. An ordinary glass pivoted centrally to battery of sufQ- l in Fig. 16, a plate of the same…
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