Observations on Mount Vesuvius, Mount Etna, and other volcanos: in a series of letters, addressed to the Royal Society / from the Honourable Sir W. Hamilton ... To which are added, explanatory notes by the author, hitherto unpublished.
- William Hamilton
- Date:
- 1772
Licence: Public Domain Mark
Credit: Observations on Mount Vesuvius, Mount Etna, and other volcanos: in a series of letters, addressed to the Royal Society / from the Honourable Sir W. Hamilton ... To which are added, explanatory notes by the author, hitherto unpublished. Source: Wellcome Collection.
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![extract fulphur and alum. This fpot, well attended to, might certainly produce a good revenue, whereas I doubt if they have hitherto ever cleared 200/. a year by it. The hollow found produced by throwing a heavy ftone on the plain of the crater of the Solfaterra feems to indi- cate, that it is f{upported by a fort of arched natural vault; and one is induced to think that there is a pool of water beneath this vault (which boils by the heat of a fubter- raneous fire {till deeper), by the very moift ftream that iffues from the cracks in the plain of the Solfaterra, which, like that of boiling water, runs off a fword or knife, prefented to it, in great drops. On the outfide, and at the foot of the cone of the Solfaterra, towards the lake of Agnano, water rufhes out of’the rocks, fo hot, as to raife the quickfilver in Fahrenheit’s ther- mometer to the degree of boiling water [7], {z] I have remarked, that after a great fall of rain, the degree of heat in this water is much lefs, which will account for what the Padre Torre fays (in his are a fact](https://iiif.wellcomecollection.org/image/b32996676_0140.jp2/full/800%2C/0/default.jpg)
