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Updated: August 11, 2024
The stones which were ejected from the crater during this eruption were often of considerable magnitude, and Borelli calculated that the diameter of one which he saw was 50 feet; it was thrown to a distance of a mile, and as it fell it penetrated the earth to a depth of 23 feet. The volume of lava emitted during the eruption amounted to many millions of cubic feet.
The seventeenth century, however, gives us three names, those of Borelli, Lana, and Robert Hooke, all of which take definite place in the history of flight. Borelli ranks as one of the great figures in the study of aeronautical problems, in spite of erroneous deductions through which he arrived at a purely negative conclusion with regard to the possibility of human flight.
When Borelli informed him of Gudin's mortal wound, Napoleon's grief was violent; he gave vent to it in repeated questions and expressions of regret; then with that strength of mind which was peculiar to him, he subdued his uneasiness, postponed his anger, suspended his chagrin, and giving himself up wholly to his occupation, he deferred until the morrow the charge of battles, for night had come on; but afterwards the hopes of a battle roused him, and he appeared next morning with the day on the fields of Valoutina.
Borelli says it is what is necessary for lifting a weight of one hundred and eighty thousand pounds, while Kiell estimates it at about eight ounces; and from this they drew the conclusion that physiology is as a well-worn phrase expresses it the romance of medicine. As they were unable to understand it, they did not believe in it. A month slipped away in doing nothing.
When she said how much she would like him to tell her about the great poets, she had imagined that she would suddenly get to know whole pages of romantic and heroic verse, in the style of the Vicomte de Borelli, only even more moving.
It may be said that practically all the conclusions which Borelli reached in his study were negative.
Here were Cardan and Raymond Lully, and a shabby set of the classics, mostly in French translations, and a score of lucubrations by French and other inventors Ponton d'Amocourt, Borelli, Chabrier, Girard, and Marey.
This was first demonstrated by Borelli, an eminent Italian mathematician and philosopher, who lived in a fertile age of discovery, and was thoroughly acquainted with the true principles of mechanics and pneumatics.
Between it and the water was a long avenue of plane trees, behind the mountain of Notre Dame de la Garde, and almost touching the little lily-bordered stream which surrounded the beautiful park and villa of the Borelli.
Man's muscles, said da Vinci, are fully sufficient to enable him to fly, for the larger birds, he noted, employ but a small part of their strength in keeping themselves afloat in the air by this theory he attempted to encourage experiment, just as, when his time came, Borelli reached the opposite conclusion and discouraged it.
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