Recreations in Mathematics and Natural Philosophy ...G. Kearsley, 1803 |
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Página x
... telescopes Of reflecting telescopes - 273 - PROB . XLV . Method of constructing a telescope , by means of which an object may be feen , even when the inftru- ment appears to be directed towards another Of microscopes PROB . XLVI ...
... telescopes Of reflecting telescopes - 273 - PROB . XLV . Method of constructing a telescope , by means of which an object may be feen , even when the inftru- ment appears to be directed towards another Of microscopes PROB . XLVI ...
Página 145
... telescope has a like index and circle fixed on the outside of it with the corresponding letters or other marks . The consequence is obvious ; the telescope being turned round its axis , till its wire cover , or become parallel to the ...
... telescope has a like index and circle fixed on the outside of it with the corresponding letters or other marks . The consequence is obvious ; the telescope being turned round its axis , till its wire cover , or become parallel to the ...
Página 146
... telescope , and x x the like section of the sliding or adjusting tube , on which is fixed an index I I. On the part of the outward tube next to the observer , is fixed a circle of letters and numbers , similarly divided and situ . ated ...
... telescope , and x x the like section of the sliding or adjusting tube , on which is fixed an index I I. On the part of the outward tube next to the observer , is fixed a circle of letters and numbers , similarly divided and situ . ated ...
Página 147
... telescope , a man in one sta tion may see a signal made by the next before him ; this person immediately repeats the same signal to the third man ; and this again to a fourth , and so on through all the stations , to the last . This ...
... telescope , a man in one sta tion may see a signal made by the next before him ; this person immediately repeats the same signal to the third man ; and this again to a fourth , and so on through all the stations , to the last . This ...
Página 170
... telescopes , and of microscopes . Perspective ought to form a part of direct optics , as it is merely a solution of the different cases of the following problem : On a given surface to trace out the image of an object in such a manner ...
... telescopes , and of microscopes . Perspective ought to form a part of direct optics , as it is merely a solution of the different cases of the following problem : On a given surface to trace out the image of an object in such a manner ...
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Outras edições - Ver tudo
Palavras e frases frequentes
anemometer angle aperture apparent magnitude appear Archimedes ascend atmosphere axis ball blue body bottom camera obscura centre of gravity circle clock colours concave mirror consequently constructed convex cubic cubic foot curious cylinder direction ditto divided effect employed equal experiment extremity eye-glass feet figure fixed focal distance focus give greater hole horizontal inclined plane ingenious invention kind last place latter length lens less light machine magnified manner means mechanism method microscope Montrelais move moveable necessary Niceron object glass obolus observed optical painted parallel pass perpendicular perpetual motion piece piston plane mirror pounds principle PROBLEM produced proportion radius raised ratio rays reflected reflecting telescopes refraction Regiomontanus retina seen shew side specific gravity spherical square stance steam stick suppose surface suspended telescope tion Troy weight tube turn velocity vertical vessel vibrations weight wheel yellow
Passagens conhecidas
Página 114 - A CENTURY OF THE NAMES AND SCANTLINGS OF SUCH INVENTIONS, as at present I can call to mind to have tried and perfected...
Página 115 - ... 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 177 - 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 115 - 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 115 - 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 176 - 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 115 - 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 403 - ... 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 402 - ... 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 11 - 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...