The Elements of Natural Or Experimental Philosophy, Volum 3T. Cadell and W. Davies, 1803 |
Inni boken
Resultat 1-5 av 25
Side 25
... such a diameter as to pass freely up and " down within the fmall tube of the thermometer . " The lower end , floating on the furface of the mercury , is carried up with it when it rifes , " while the piece at the upper end , being of ...
... such a diameter as to pass freely up and " down within the fmall tube of the thermometer . " The lower end , floating on the furface of the mercury , is carried up with it when it rifes , " while the piece at the upper end , being of ...
Side 155
... Such cauflicks may be feen upon the surface of milk , or upon any opaque whitish mixture of liquors contained in a white china - cup , or upon the bottom of a fnuff - box , whofe rim is well polished , when the light of a candle , or of ...
... Such cauflicks may be feen upon the surface of milk , or upon any opaque whitish mixture of liquors contained in a white china - cup , or upon the bottom of a fnuff - box , whofe rim is well polished , when the light of a candle , or of ...
Side 156
... Such a focus of reflected rays , viz . when its diftance is equal to half the radius of concavity , is called the principal focus of that reflector . The nearer the focus of incident rays comes to the furface of the reflector , the ...
... Such a focus of reflected rays , viz . when its diftance is equal to half the radius of concavity , is called the principal focus of that reflector . The nearer the focus of incident rays comes to the furface of the reflector , the ...
Side 161
... such as to form the reflected image of the flower juft over the pot or ftand D. Then an eye fituated at C , and looking ftraight through the hole in the partition , will perceive an image of the flower at I ; and when the light is ...
... such as to form the reflected image of the flower juft over the pot or ftand D. Then an eye fituated at C , and looking ftraight through the hole in the partition , will perceive an image of the flower at I ; and when the light is ...
Side 162
... Such deformed figures ( called ana- morphoses ) are fold by the opticians , together with a cylindrical or conical reflector * . There is one fhape , however , for a concave re- flector , which is fuperior to all others , and that is ...
... Such deformed figures ( called ana- morphoses ) are fold by the opticians , together with a cylindrical or conical reflector * . There is one fhape , however , for a concave re- flector , which is fuperior to all others , and that is ...
Vanlige uttrykk og setninger
alfo alſo angle angle of incidence appear atmoſphere attraction battery becauſe body cafe caloric colours concave conductor confiderable confifts convex convex lens courſe defcribed degree diſcharge diſtance divifions eafily electric fluid electrified electrometer equal eſpecially eye lens faid falt fame fcreen fecond feems feen fhall fhews fhock fide filk filver fingle firſt fituated fize fmall focal diftance focus fome fometimes fouth fpark fpecific ftate ftrong fubftances fuch fufficient furface glaffes glafs glaſs heat hole inches increaſe inftrument infulated iron itſelf lefs lenfes light magnet magnifying meaſure mercury metallic moft moſt muft muſt neceffary needle nitrous acid north pole obferved object object lens paffing perfons phial Philofophical piece plate poffeffed pofitive pole prefent prifm purpoſe quantity rays reflected reflector refraction reprefents ſmall ſtate teleſcope temperature thefe thermometer theſe thofe thoſe tricity tube uſed veffel whilft wire zinc
Populære avsnitt
Side 287 - When the rising sun shines from that point whence its incident ray forms an angle of about 45° on the sea of Reggio, and the bright surface of the water in the bay is not disturbed either by the wind or...
Side 291 - ... let this mixture be rammed into a crucible of about an inch and a half in depth, till it be almoft full ; and let it be placed in...
Side 287 - ... palms, and nearly down to the sea, the observer will behold the scene of the same objects not only reflected from the surface of the sea, but likewise in the air, though not so distinct or well defined as the former objects from the sea.
Side 287 - Lastly, if the air be slightly hazy and opaque, and at the' same time dewy and adapted to form the Iris, then the abovementioned objects will appear only at the surface of the sea, as in the first case, but all vividly coloured or fringed witH red, green, blue, and other prismatic colours *. " As the day advances, the fairy scene gradually disappears.
Side 287 - Reggio, and the bright surface of the water in the bay is not disturbed either by the wind or the current, the spectator being placed on an eminence of the city, with his back to the sun, and his face to the sea ; on a sudden there appear in the water, as in a catoptric theatre, various multiplied objects, viz.
Side 418 - THE electric organs of the torpedo are placed on each side of the cranium and gills, reaching from thence to the semicircular cartilages of each great fin, and extending longitudinally from the anterior extremity of the animal to the transverse cartilage, which divides the thorax from the abdomen...
Side 203 - When the rings were examined by looking through the lenses in the opposite direction, the central spot appeared white, and, in other rings, red was opposite to blue, yellow to violet, and green to a compound of red and violet ; the colours formed by the transmitted and...
Side 140 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Side 513 - ... the attraction of their matter. There is an attraction exerted between the overcharged extremity of one magnetic body and the undercharged extremity of the other, on account of the attraction between that fluid and the matter of the body ; but, to explain the repulsion which takes place between their undercharged extremities, we...
Side 278 - ... the distance of the small circle, and also of the parallel lines from your eye; divide then the distance of the former by that of the latter, and you will have the magnifying power of the telescope required.