Popular science monthly . cceeded inobtaining artificial heats that al-most rival the intensity of the sun, theaccomplishment has made the demandupon him that, in harnessing this terrificheat for industrial purposes, he shalldevise some means of measuring it. Formany years after electric heat was knownand used industrially the exact tempera-tures which existed were only guessed , an instrument known as thethermo-electric pyrometer has come intouse, but this ingenious type of thermom-eter has the serious limitation that itwill melt when the temperature haspassed a certain point. The
Popular science monthly . cceeded inobtaining artificial heats that al-most rival the intensity of the sun, theaccomplishment has made the demandupon him that, in harnessing this terrificheat for industrial purposes, he shalldevise some means of measuring it. Formany years after electric heat was knownand used industrially the exact tempera-tures which existed were only guessed , an instrument known as thethermo-electric pyrometer has come intouse, but this ingenious type of thermom-eter has the serious limitation that itwill melt when the temperature haspassed a certain point. The latestdevelopment in heat-measuring devicesis an optical instrument, which, while itis placed in operation many feet from theheat source, will measure the tempera-ture with a fine degree of accuracy. The sight pyrometer, as it might becalled, really takes up the measurementof temperatures where the ordinarypyrometer leaves off. It can safely andaccurately measure heat at temperaturesas high as 7200 degrees Fahrenheit. The. MLasurinu Htat-Trcating Temperatures With theSight Pyrometer Many Feet from the Heat Source Popular Science Monllili/record is 331 mimmiini temperature it \vi1200 (let;rees. The i)rin(iiile upon wliicli the opera-tion of tile sisiiit pyrometer is l)ased isthe simple physical law that the intensityof light emitted by a heated body isiirectiy |)roportioiial to its temperature. In iookiiiij throiiijh the pyrometer,two adjacent semicircular fields ol \isioiare obser\id, one beinsj; illuminated bythe small standardized electric lamj) inthe pyrometerand the otherby the objectwhose temper-ature is to bemeasured. Thered ray of thespectrum isused and veryslight differen-ces in theintensity o fthe heat in theobject underin\ estigationproduce (|uileperceptible differences in the shade. In taking readings, the intensity ofthe field illuminated by the lamp isadjusted by turning the eye-piece untilthe line separating the two fields iseliminated, and the corresponding tem-p
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
