sufficient for the resolution of a beam by side, but with a space of a few inches between the an appreciable length of time. of white sunlight into its constituent colors. By pro- This beam is jecting the dispersed beam obliquely upon a smooth the ordinary rocking prism. white surface, the spectrum… … 2.-ROCKING PRISM ADAPTED TO THE LANTERN. ROCKING PRISM. appear upon the screen with the exception of the colored extremities. With the prism not shown in the engraving, the fallers are alternately supported in this way, it is aneasy matter to turn it must have existed in the light before it reached…
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