Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 342
ction of a single layer of either gas wasrendered perfectly sensible. The heated air, moreover,from two or three candle-flames, or even from a singleflame, or from a heated poker, was found perfectly compe-tent to stop the flames agitation. The same remark appliesto vapours. Three or four layers of… … over, a small high-pitched reed might be substituted, withadvantage, for the bell. The simple apparatus sketched in fig. 158 for showingreflection by gases, vapours, and heated air has been de-vised by my assistant. At the end A of the square pipeA B is a small concertina reed of high pitch, the…
Sound
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
