Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 248
o rotate across thebeam near the focus of the concave mirror. Immediatelybehind the disc was placed the flask containing the gas or RHYTHMIC ABSORPTION OF RADIANT HEAT. 226 vapour to be examined, while an india-rubber tube,ending in a hoHow cone of ivory or boxwood, connectedthe flask with the ear.… … proved to be powerful absorbers of radiant heat. Thefinal arrangement was that shown in fig. 117. The source of heat is the carefully worked and centredlime-cylinder L, heated by the oxy-hydrogen flame. Therays from this source are received by the concave mirrorR, and converged upon the bulb B,…
Sound
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