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Updated: June 27, 2025
Finally we had a few words on the origin of volcanicity and afterwards some discussion on an old point the relation to the sea. Why are volcanoes close to sea? Debenham thinks not cause and effect, but two effects resulting from same cause. Great argument as to whether effect of barometric changes on Erebus vapour can be observed.
The number of barometric observations made upon the line and in its vicinity is 5,767; besides which there were made at Calais, for comparison with the level of mean tide on the St. Croix, 1,336 similar observations.
I confess that, for my own part, I felt a bit puzzled; I did not quite know what to make of the weather indications. It might be that nothing worse than a violent thunderstorm was brewing; but against this theory there was to be set the sudden and ominous decline of the barometric pressure.
The slope of the river is in fact extremely gentle from the Great Cataracts to Angostura; and, if a barometric measurement were wanting, the difference of height might be determined by approximation, by measuring from time to time the velocity of the stream, and the extent of the section in breadth and depth. We had some observations of the stars at Uruana.
The soil on which the mountains of Parime rise, is slightly convex. By barometric measures I found that, between 3 and 4 degrees north latitude, the plains are elevated from 160 to 180 toises above sea-level.
Remember that the climate of this entire region will now be changed, since the barometric isobars have been lifted up, and the line of thirty inches pressure now meets the edge of the Colorado plateau. There may be a corresponding change in the rainfall and in all the conditions of culture and fertility."
The valley of Patias, for instance, running from north-east to south-west is only 350 toises of absolute height, even above the junction of the Rio Guachion with the Quilquasi, according to the barometric measures of M. Caldas; and yet it is surrounded by the highest summits, the Paramos de Puntaurcu and Mamacondy.
My own barometric levellings would make the bed of the Mahanuddy and Ganges at the western extremity of the delta, considerably higher than I should have expected, considering how gentle the current is, and that the season was that of low water.
A barometric switch can be installed that will act at a certain altitude, or a signal can be sent from the ground." "The antenna," Scotty said. "It can send a signal." "Sure." "I'm with you all the way, until you say this shows why the stingarees fly. Why send up rockoons? What's the reason?" Rick forgot he was holding a coffee cup and waved his hand.
Our distresses being at an end, I now determined to rest the men in camp and give the scientific department of the Expedition a chance. First, I made a barometric observation, to get our altitude, but I could not perceive that there was any result.
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