 | 1829 - 906 páginas
...be the cause of the phenomena, some of these substances ought occasionally to be found in the Java, or the combustion ought to be increased at the moment...a demonstration of the existence of great cavities belowfilled with aeriform matter: and the same excavations which in the active state of the volcano... | |
 | Sir Richard Phillips - 1830 - 728 páginas
...the columns of steam which usually 'arise in large 'quantities when Vesuvius is tranquil were »ow scarcely visible, and a piece of paper thrown into the aperture did not rise again ; ,s(s that- there was every reason to suppose the existence of a descending current of air> . The... | |
 | 1832 - 636 páginas
...before the eruption of Vesuvius was at its height; "the columns of steam," says he, " which usually rise in large quantities when Vesuvius is tranquil, were...to suppose the existence of a descending current of air."j It might however be supposed, that the connexion of two volcanoes so nearly approached as Vesuvius... | |
| |
... communication between this crater and that of Vesuvius: whenever Vesuvius is in an active state, the solfaterra is comparatively tranquil. I examined the bocca of the solfaterra on the 21st of February, 1820, two days before the activity of Vesuvius... 