Recreations in Mathematics and Natural Philosophy ...

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Página 126 - A CENTURY OF THE NAMES AND SCANTLINGS OF SUCH INVENTIONS, as at present I can call to mind to have tried and perfected...
Página 127 - ... hours it burst and made a great crack ; so that, having a way to make my vessels so that they are strengthened by the force within them, and the one to fill after the other, I have seen the water run, like a constant fountain-stream, forty feet high. One vessel of water, rarefied by fire, driveth up forty of cold water. And a man...
Página 199 - Affix to a dark wall a round piece of paper an inch or two in diameter; and, a little lower, at the distance of two feet on each side, make two marks ; then place yourself directly opposite to the paper, and hold the end of your finger before your face in such a manner, that when the right eye is open, it shall conceal the mark on the left, and, when the left eye is open, the mark on the right : if you then look with both eyes to the end of your finger, the paper, which is not at all concealed by...
Página 127 - I have taken a piece of a whole cannon, whereof the end was burst, and filled it three quarters full of water, stopping and screwing up the broken end, as also the touchhole ; and making a constant fire under it, within twenty-four hours it burst and made a great crack...
Página 127 - One vessel of water rarefied by fire driveth up forty of cold water ; and a man that tends the work is but to turn two cocks, that, one vessel of water being consumed, another begins to force and refill with cold water, and so successively, the fire being tended and kept constant, which the selfsame person may likewise abundantly perform in the interim, between the necessity of turning the said cocks.
Página 198 - Fix, at the •height of the eye, on a dark ground, a small round piece of white paper, and a little lower, at the distance of two feet to the right, fix up another, of about three inches in diameter; then place yourself opposite to the first piece of paper, and, having shut the left eye, retire...
Página 127 - An admirable and most forcible way to drive up water by fire, not by drawing or sucking it upwards, for that must be as the philosopher calleth it, infra spheeram activitatis, which is but at such a distance.
Página 425 - ... keep a watchful eye over that art. Who indeed can doubt that music is capable of producing such an effect? Let us only interrogate ourselves, and examine what have been our sensations on hearing a majestic or warlike piece of music, or a tender and pathetic air sung or played with expression.
Página 424 - ... diseases, an able musician might therefore prescribe an air for rooting out a vicious passion. The story of Timotheus, the director of the music of Alexander the Great, is well known One day, while the prince was at table, Timotheus performed an air in the Phrygian mode, which made such an impression on him that, being already heated with wine, he flew to his arms, and was going to attack his guests, had not Timotheus immediately changed the style of his performance to the Sub-Phrygian. This...
Página 23 - He first taught the principle, " that a body, immersed in a fluid, loses as much in weight as the weight of an equal volume of the fluid...