Note 3 — HOME STUDIES IN CHEMISTRY AND PHYSICS.
Reading edition
“Geissler’s tubes,” ghīceˈler. The spectrum of any gas can be best obtained by placing the gas in these tubes, and then passing the electric current through. If the gas is hydrogen, the spectrum will consist of a bright red, a green, and a blue line. Each gas casts its own spectrum. In this way the spectroscope aids in the analysis of substances. The different spectra formed reveal the elements.