 | Andrew Ure - 1821 - 418 sider
...thin. These threads, viewed by transmitted light, are red; but, by reflected light, they are gray, and have the metallic lustre. When selenium is heated...which has no particular smell, and which is condensed in the form of a cinnabar-red powder, yielding a species of flowers, as happens to sulphur in the same... | |
 | Thomas Curtis - 1829 - 798 sider
...not so intense as that of the vapor of sulphur ; but it is more intense than chlorine gas. The vapor tis vapor may be condensed by the cold air, a red smoke is formed, which has no particular smell, and which... | |
 | Thomas Thomson - 1831 - 1060 sider
...of sulphur ; but more intense than chlorine gas. The vapour condenses in the neck of the retort in black drops, which unite into larger drops, as in the distillation of mercury. "When selenium is heated in the air, or in vessels so large that the vapour may be condensed by the... | |
 | Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford, Henry Vethake - 1832 - 622 sider
...dark-yellow vapor, not so intense as the vapor of sulphur: the vapor condenses in the neck of the retort in black drops, which unite into larger drops, as in the distillation of mercury. Selenium is a very bad conductor of heat, and a nonconductor of electricity. It combines with three... | |
 | Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford, Henry Vethake - 1832 - 628 sider
...dark-yellow vapor, not so intense as the vapor of sulphur: the vapor condenses in the neck of the retort in black drops, which unite into larger drops, as in the distillation of mercury. Selenium is a very bad conductor of heat, and a nonconductor of electricity. It combines with three... | |
 | Encyclopaedia Americana - 1832 - 620 sider
...dark-yellow vapor, not so intense as the vapor of sulphur: the vapor condenses in the neck of the retort in black drops, which unite into larger drops, as in the distillation of mercury. Selenium is a very bad conductor of heat, and a nonconductor of electricity. It combines with three... | |
 | Francis Lieber - 1851 - 618 sider
...dark-yellow vapor,. not so intense as the vapor of sulphur: the vapor condenses in the neck of the retort in black drops, which unite into larger drops, as in the Distillation of mercury. Selenium is a very bad conductor of heat, and a nonconductor of electricity. It combines with three... | |
 | Francis Lieber, Edward Wigglesworth, Henry Vethake - 1851 - 624 sider
...vapor, not so intense as the vapor of sulphur: the vapor condensos in the neck of the retort in hlack drops, which unite into larger drops, as in the distillation of mercury. Selenium is a very had conductor of heat, and a nonconductor of electricity. It combines with throe... | |
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... easily scratched by the knife ; is brittle, and readily reduced to powder. When heated in a retort, it begins to boil at a temperature below that of a red heat, and assumes the form of a dark-yellow vapor, not so intense as the vapor of sulphur: the... 