Tyndall, John, 1820-1893 · New York : Appleton · leaf 271
redsensitive. In this way the observation of Dr. Le Conte is easilyand strikingly illustrated ; in our subsequent, and far moredelicate experiments, the precaution just referred to is stillmore essential. § 9. Experiments on Flames from Circular Apertures. A long flame may be shortened and a short… … Fig. 130.
Sound
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![An illustration from Sketch of Prof. John Le Conte ; [and] Sensitive flames and sound-shadows (1889)](https://img.insideoutlibrary.com/img/200/ia-sketchofprofjohn00stevrich-25-3.webp)
