Recreations in Mathematics and Natural Philosophy ...G. Kearsley, 1803 |
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Página vi
... proportions - · - 178 181 PROB . II . To conftruct a portable camera obfcura 1. To reprefent objects in their natural fituation - 180 11. To reprefent objects in fuch a manner as to make that which is on the right appear on the left ...
... proportions - · - 178 181 PROB . II . To conftruct a portable camera obfcura 1. To reprefent objects in their natural fituation - 180 11. To reprefent objects in fuch a manner as to make that which is on the right appear on the left ...
Página viii
... proportions - PAGE 215 216 217 PROB . XXIV . Any quadrilateral figure being given ; to find the different parallelograms or rectangles of which it may be the perspective reprefentation ; or any paralle- logram , whether right angled or ...
... proportions - PAGE 215 216 217 PROB . XXIV . Any quadrilateral figure being given ; to find the different parallelograms or rectangles of which it may be the perspective reprefentation ; or any paralle- logram , whether right angled or ...
Página ix
... proportions PROB . XL . To defcribe , on a horizontal plane , a distorted figure , which hall appear in its proper proportions , when feen as reflected by a conical mirror from a given point in the axis of that cone produced - · PROB ...
... proportions PROB . XL . To defcribe , on a horizontal plane , a distorted figure , which hall appear in its proper proportions , when feen as reflected by a conical mirror from a given point in the axis of that cone produced - · PROB ...
Página xi
... proportion which the light of the moon bears to that of the fun PROB . LXIII . Of certain optical illufions Additional amufements with concave mirrors , & Simple camera obfcura The dioptrical paradox - The optical paradox The endless ...
... proportion which the light of the moon bears to that of the fun PROB . LXIII . Of certain optical illufions Additional amufements with concave mirrors , & Simple camera obfcura The dioptrical paradox - The optical paradox The endless ...
Página 10
... proportion : as 6 is to 4 , so is 150 to a fourth term , which will be 100. The person placed at the extremity B , will therefore support 100 pounds , and consequently the one placed at A will have to support only 50 . REMARK . The ...
... proportion : as 6 is to 4 , so is 150 to a fourth term , which will be 100. The person placed at the extremity B , will therefore support 100 pounds , and consequently the one placed at A will have to support only 50 . REMARK . The ...
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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...