Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ry flame tests byspectroscopic observation. In the blowpipe laboratory the chiefHse of the spectroscope will be to identify the metals of the potas-sium and calcium families singly orin mixtures. For this purpose thedirect vision spectroscope of Hoff-man, Fig. 301, is perhaps the mostconvenient. The substance under examinationshould be moistened with hydro-chloric acid and brought on a plati-num wire into the non-luminous flameof the Bunsen burner as in the ordi-nary flame test. In viewing the flamet
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ry flame tests byspectroscopic observation. In the blowpipe laboratory the chiefHse of the spectroscope will be to identify the metals of the potas-sium and calcium families singly orin mixtures. For this purpose thedirect vision spectroscope of Hoff-man, Fig. 301, is perhaps the mostconvenient. The substance under examinationshould be moistened with hydro-chloric acid and brought on a plati-num wire into the non-luminous flameof the Bunsen burner as in the ordi-nary flame test. In viewing the flamethrough the properly adjusted spec-troscope certain bright lines will be seen, and by comparing thesewith the chart, Fig. 304, or with substances of known composition,the nature of the substance may be determined. The sodium linewill almost invariably be present and the position of the otherlines will be best fixed by their situation relative to this brightyellow line. The more ordinary form of spectroscope. Fig. 302, has specialadvantages in allowing an easy comparison of flames. /I is the. Fig. 302.
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