Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 265
242 LECTURE VI. my hand and cause the image to pass over the screenWere the flame silent and steady, we should obtain acontinuous band of light; but it quivers, and emits atthe same time a deep note. On twirling the mirror^Fig. 122. … therefore, we obtain, instead of a continuous band,a luminous chain of images. By fast turning, theseimages are drawn more widely apart; by slow turning,they are caused to close up, the chain of flames passingthrough the most beautiful variations. Clasping the RIJKE S FLAME. 243 lower end, b, of…
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