Page:Popular Science Monthly Volume 7.djvu/463

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 * colspan="2"|PSM V07 D463 The pyrophone.jpg
 * width="190" |Fig. 1.—Tube with Singing-Flames showing Mechanism by which the Gas-Jets are made to diverge, and thus give rise to the Sound.
 * width="190" |Fig. 2.—Same, with Flames united, when no Sound is produced.
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