in front of the lantern tube, to about two inches long, is placed in the lantern, and in interrupt the light beam, to show the effects of inter- Two images of the aperture of the card will appear on front of it is held a strip of plate glass. Solong as the mittent light on moving objects. the… … in the fleld of the lantern. The changes from blue to thescreen, the card is released, and the pink are very pretty. The change begins at the outside. rubber withdraws it from the lower semicircular aper- for the spar may be arranged as shown in Fig. 12, the By coating glasses with solutions of…
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