. A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice . LIGHT RAYS WITH PEEDOMINATING EADIANT HEAT 537 called transparent. An alum so
. A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice . LIGHT RAYS WITH PEEDOMINATING EADIANT HEAT 537 called transparent. An alum solution will stop heat-rays while itpasses light, and a piece of smoked rock salt will shut out all light, butwill let heat-rays pass freely. The transmission of conducted (ordinary) heat depends on heat-ing the surrounding air.* To raise the temperature of any substancefifty degrees by heat conducted through a separating layer of air itis absolutely necessary to raise the air fifty degrees. Radiant lumi-nous heat will give the same result without heating the air. Luminousheat radiates across space; it can be diffused as light; it can equallybe reflected, and directed by reflectors. A piece of tinder can be fijedby reflected radiant heat twenty feet from the light, as if it had beenin contact with the flame. Sunburn takes place on the Alps with theair freezing. Radiant luminous heat results from the blending to-gether of heat-rays, luminoug-rays, and chemical-rays, and it is pos-sible to alt«r the proportions
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Keywords: ., bookcentury1900, bookdecade1900, bookidsystemofinst, bookyear1902
