The Elements of Natural Or Experimental Philosophy, Volumen3T. Cadell and W. Davies, 1803 |
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Página 110
... reflectors , lenfes , prifms , & c . are but flightly mentioned in this chapter ; for they will be particu- larly defcribed in the next Section , which treats of light , and where the different fhapes of bodies are more effentially ...
... reflectors , lenfes , prifms , & c . are but flightly mentioned in this chapter ; for they will be particu- larly defcribed in the next Section , which treats of light , and where the different fhapes of bodies are more effentially ...
Página 112
... reflector , confifting of 168 small plane reflectors , which were disposed in a hollow fegment of a sphere , fo as all to reflect the light and heat of the fun to the fame place . With this inftrument he could fire wood at the distance ...
... reflector , confifting of 168 small plane reflectors , which were disposed in a hollow fegment of a sphere , fo as all to reflect the light and heat of the fun to the fame place . With this inftrument he could fire wood at the distance ...
Página 115
... reflectors , about 10 inches , or more , in diameter , and fituated facing each other at the distance of about 15 feet . Suppofe the focus of AB to be at E , 18 inches diftant from its fur- face , as also the focus of CD to be at F , 18 ...
... reflectors , about 10 inches , or more , in diameter , and fituated facing each other at the distance of about 15 feet . Suppofe the focus of AB to be at E , 18 inches diftant from its fur- face , as also the focus of CD to be at F , 18 ...
Página 116
... reflector , and the thermometer will rife . Uncover the reflector , and the thermometer will be lowered again , & c . The refult of this laft experiment has been fup- pofed to militate against the commonly received theory of heat ...
... reflector , and the thermometer will rife . Uncover the reflector , and the thermometer will be lowered again , & c . The refult of this laft experiment has been fup- pofed to militate against the commonly received theory of heat ...
Página 117
... reflectors . The artificial production of cold is by no means fo eafy as the production of heat ; but it must at the fame time be confeffed , that the former is not fo effentially neceffary as the latter . 3 3 The . The methods of ...
... reflectors . The artificial production of cold is by no means fo eafy as the production of heat ; but it must at the fame time be confeffed , that the former is not fo effentially neceffary as the latter . 3 3 The . The methods of ...
Términos y frases comunes
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
Pasajes populares
Página 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...
Página 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...
Página 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.
Página 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.
Página 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.
Página 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...
Página 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...
Página 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.
Página 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...
Página 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.