Tyndall, John, 1820-1893 · New York : Appleton · leaf 326
or four layers of coal-gas and carbonic acicl, sufficedto still the agitated flame. Nay, with improved manip-ulation, the action of a single layer of either gas MTasrendered perfectly sensible. So also as regards heatedlayers of air, not only were sixty-six or twenty-twoheated platinum wires found… … to vapors. Three or four heated layers of air, saturatedwith the vapor of a volatile liquid, stilled the flame; and,by improved manipulation, the action of a single saturatedlayer could be rendered sensible. In all these cases,moreover, a small, high-pitched reed might be substitutedfor the bell.…
Sound
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