The Elements of Natural Or Experimental Philosophy, Volum 3T. Cadell and W. Davies, 1803 |
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Resultat 1-5 av 24
Side 139
... single point of a luminous body , as from a point of the furface of the thofe particles will be more than fufficient to give our eyes an uninterrupted vifion of that point ; yet ftill those particles , on account of their immenfe ...
... single point of a luminous body , as from a point of the furface of the thofe particles will be more than fufficient to give our eyes an uninterrupted vifion of that point ; yet ftill those particles , on account of their immenfe ...
Side 159
... single point of the object , is a pencil whose base is equal to the pupil or aperture of the eye , and the fame is the cafe when the object is viewed by reflection from a plane mirror ; but when the mirror is concave , then on account ...
... single point of the object , is a pencil whose base is equal to the pupil or aperture of the eye , and the fame is the cafe when the object is viewed by reflection from a plane mirror ; but when the mirror is concave , then on account ...
Side 188
... single prifmatic colour be permitted to pass through a hole in the fcreen , and then be received upon another fcreen , the image will be of the fame colour , for instance , green , and circular . Now , by placing a prifm behind the ...
... single prifmatic colour be permitted to pass through a hole in the fcreen , and then be received upon another fcreen , the image will be of the fame colour , for instance , green , and circular . Now , by placing a prifm behind the ...
Side 226
... single radiant point , and the distance of that focus from the furface of the lens is called the focal diftance of thefe rays . Even a globe is faid to have fuch a focus , meaning , however , of the middlemoft part of the globe . 1 It ...
... single radiant point , and the distance of that focus from the furface of the lens is called the focal diftance of thefe rays . Even a globe is faid to have fuch a focus , meaning , however , of the middlemoft part of the globe . 1 It ...
Side 241
... single point of the objects is admitted ; and fecondly , the inflec- tion of light is avoided by the enlargement of the hole . the It will appear from the following defcription , that eye is a moft excellent camera obfcura , having all ...
... single point of the objects is admitted ; and fecondly , the inflec- tion of light is avoided by the enlargement of the hole . the It will appear from the following defcription , that eye is a moft excellent camera obfcura , having all ...
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.