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And here we may note a serious objection to the heating of a bath by convection; for while the head may be in a high degree of heat the feet are in comparatively cool air, whereas, if possible, it should be just the reverse. In convected heat, this of course applies in its entirety, as where so-called radiant heat is employed the evil is not quite so marked.
In the following pages, however, I have, in this respect, treated of the subject from the broadest point of view, and have explained the method of designing the hot-air bath pure and simple, looking upon the convected and radiating heat principles as both good of their kind, and perfectly admissible modes of applying heat to the human frame.
Terrestrial refraction is the same thing, occurring whenever there is a difference of density in the aerial strata. The atmosphere absorbs some portion of the light which it receives. It is not all reflected or refracted or even penetrative. Objects seen under various degrees of light, either convected or retarded by different media, appear near or distant, distinct or confused.
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