The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . known, but probably lies between 3,500° and3,900° C. As a spectroscopic source it is ad-mirable in nearly every respect except that inthose regions of the spectrum which are mosteasily studied carbon has a strong spectrum ofits own which is always superposed upon thatof the substance under investigation. In thecase of metals, the easiest method of avoidingthis difliculty is to use a rapidly rotating metaldisk for one electrode and a metal rod
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . known, but probably lies between 3,500° and3,900° C. As a spectroscopic source it is ad-mirable in nearly every respect except that inthose regions of the spectrum which are mosteasily studied carbon has a strong spectrum ofits own which is always superposed upon thatof the substance under investigation. In thecase of metals, the easiest method of avoidingthis difliculty is to use a rapidly rotating metaldisk for one electrode and a metal rod for theother. The incandescent metal vapor thus ob-tained yields the purest spectra known. Electric Spark.— Of all sources of radiationthat which is most generally convenient and mostwidely used is perhaps the electric spark, ob-tained by use of an ordinary induction discharges may also be obtained from anelectrostatic machine, such as the Wimshurst,from a Tesla coil, or even from a high voltagestorage battery. In general the electric sparkproduces two spectra, namely, the spectrum ofthe electrodes and the spectrum of the air or mX.
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidamericanaunivers14newy
