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…to his ends, and that he had a Revelation of it in his sleep. At length all these Iron Engines were set in order, and the workmen, to the number of fifty began to let down a Caldron well fastened to a strong Iron Chain, with other Engines secured, and the Priest himself set his hand to the work: But as they thought to draw up the Caldron full of rich melted …
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/chapter6.php