An Introduction to Natural Philosophy: Illustrated with Copper Plates, Volume 1J. Johnson, 1805 |
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Page 111
... fhadow L of the earth is always projected in a circular form . Now , it is evident , that the body , whofe fhadow is in all positions a circle , muft itself be a globe . Unfurnished with thofe proofs , which the faga- M city and more ...
... fhadow L of the earth is always projected in a circular form . Now , it is evident , that the body , whofe fhadow is in all positions a circle , muft itself be a globe . Unfurnished with thofe proofs , which the faga- M city and more ...
Page 138
... fhadow on its body : whence we may be cer- tain of the opacity of both : for if the ring were not opaque it could caft no fhadow , and if Saturn fhone by any native light of his own , the inter- ception of the Sun's light would cause no ...
... fhadow on its body : whence we may be cer- tain of the opacity of both : for if the ring were not opaque it could caft no fhadow , and if Saturn fhone by any native light of his own , the inter- ception of the Sun's light would cause no ...
Page 139
... fhadow of Jupiter . From these confiderations is obtained a good y method of finding the parallax of the Earth's annual orbit . For which purpose the inftant of the fatel- lite's first disappearance behind the body of Jupiter must be ...
... fhadow of Jupiter . From these confiderations is obtained a good y method of finding the parallax of the Earth's annual orbit . For which purpose the inftant of the fatel- lite's first disappearance behind the body of Jupiter must be ...
Page 143
... fhadow of the Earth , is deprived of the Sun's light , the Earth being inter- pofed between it and the Sun : which phenomenon is called a lunar eclipfe , or eclipse of the Moon . At other times , that is , when the new or full Moon ...
... fhadow of the Earth , is deprived of the Sun's light , the Earth being inter- pofed between it and the Sun : which phenomenon is called a lunar eclipfe , or eclipse of the Moon . At other times , that is , when the new or full Moon ...
Page 146
... fhadows of the Moon and Earth are the caufes of eclipfes , it will be neceffary firft to deter- mine the figure of thofe ... fhadow will be a cylinder between the lines CG , DH , whofe bafe is indefi- nitely diftant . In either cafe the ...
... fhadows of the Moon and Earth are the caufes of eclipfes , it will be neceffary firft to deter- mine the figure of thofe ... fhadow will be a cylinder between the lines CG , DH , whofe bafe is indefi- nitely diftant . In either cafe the ...
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An Introduction to Natural Philosophy, Vol. 1 of 2: Illustrated With Copper ... William Nicholson No preview available - 2017 |
An Introduction to Natural Philosophy, Vol. 2 of 2: Illustrated With ... William Nicholson No preview available - 2016 |
Common terms and phrases
alfo alſo angle apfides appear axis becauſe bodies cafe caufes cauſe centripetal force circle colours confequently confiderable conjunction courſe deſcribed diameter diminiſhed direction diſtance Earth ecliptic elongation equal faid fame fecond feen fhadow fhewn fhould fide fimilar fince firft firſt fituated fixed ftars fmall fome fquare fuch fufficient fuppofed furface glaſs gravity greater greateſt inclined plane increaſe inferior planet inftant inftruments interfecting inverſely itſelf Jupiter laft laſt lefs leſs likewife mafs maſs meaſure Moon Moon's moſt motion move muft muſt node obferved occafion oppofition orbit paffes paffing parallax parallel paſs perpendicular planet pofition proportion purpoſe quadratures quantity ratio rays of light reaſon reflection refraction refrangible reft repreſent retrograde motion revolution revolve Saturn ſeen ſhall ſmall ſpace ſquare ſtars Sun's ſuppoſed teleſcope thefe theſe thofe thoſe tion uſed velocity Venus weight Whence whofe whoſe
Popular passages
Page 301 - Boyle] as when it is adjacent to it. Secondly, If Light in its paflage out of Glafs into Air be incident more obliquely than at an Angle of 40 or 4 1 Degrees it is wholly reflected, if lefs obliquely it is in great meafure tranfmitted.
Page 287 - ... hot; that the vibrations thus excited are propagated in the refracting or reflecting medium or substance, much after the manner that vibrations are propagated in the air for causing sound, and move faster than the rays so as to overtake them; and that when any ray is in that part of the vibration which conspires with its motion, it easily breaks through a refracting surface, but when it is in the contrary part of the vibration which impedes its motion, it is easily reflected...
Page 276 - Thus (hall there be made two Bows of Colours, an interior and ftronger, by one reflexion in the Drops, and an exterior and fainter by two ; for the Light becomes fainter by every reflexion.
Page 276 - F, and ftrike the fenfes with the intermediate Colours in the order which their degrees of refrangibility require , that is, in the progrefs from...
Page 304 - fmall to be vifible. And therefore, if light were " reflected by impinging on the folid parts of the " glafs, it would be fcattered as much by the moft *' polifhed glafs, as by the rougheft. So then it re...
Page 275 - Eye, and thereby ftrike the fenfes with the deepeft violet Colour in that region. And in like manner the Angle SFO being equal ta the Angle P OF, or 42 deg.
Page 292 - Feathers of fome Birds, and particularly thofe of Peacocks Tails, do, in the very fame part of the Feather, appear of feveral Colours in feveral Pofitions of the Eye, after the very fame manner that thin Plates...
Page 269 - The instance of the separation of the primary colours of light, which seems most remarkable, is that of the RAINBOW. It is formed, in general, by the reflection of the rays of the sun's light from the drops of falling rain, though frequently it appears among the waves of the sea, whose heads, or tops, are blown by the wind into small drops, and it is sometimes seen on the ground, when the sun shines on a very thick dew.
Page 301 - Room be fucceffively caft on a fecond Prifm placed at a greater diftance from the former, in fuch -manner that they are all alike incident upon it, the fecond Prifm may be fo inclined to the incident Rays, that thofe which are of a blue Colour fhall be all reflected by it, and yet thofe of a red Colour pretty copioufly tranfmitted. Now if the...
Page 304 - Ray is effected, not by a single point of the reflecting Body, but by some power of the Body which is evenly diffused all over its Surface, and by which it acts upon the Ray without immediate Contact.