Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and Miscellaneous Literature, المجلد 15Archibald Constable, 1823 |
من داخل الكتاب
النتائج 1-5 من 30
الصفحة 176
... converge to a real focus , the excess of refraction must be in the convex lens . Also , as the convex glass is to refract the most , it appeared from his experiments , that it must be made of crown glass , and the concave of white flint ...
... converge to a real focus , the excess of refraction must be in the convex lens . Also , as the convex glass is to refract the most , it appeared from his experiments , that it must be made of crown glass , and the concave of white flint ...
الصفحة 178
... converge all of them to one point either by single or opposite refractions . A fluid , in which the particles of marine acid and metalline par- ticles hold a due proportion , at the same time that it separates the extreme rays of the ...
... converge all of them to one point either by single or opposite refractions . A fluid , in which the particles of marine acid and metalline par- ticles hold a due proportion , at the same time that it separates the extreme rays of the ...
الصفحة 193
... converges them lycus , Kep- upon the retina . He did not , however , seem to be ler , & c . concerning aware that an image of every visible object was thus vision . formed upon the retina , though this seems hardly to have been a step ...
... converges them lycus , Kep- upon the retina . He did not , however , seem to be ler , & c . concerning aware that an image of every visible object was thus vision . formed upon the retina , though this seems hardly to have been a step ...
الصفحة 200
... converge to a point on the retina ; yet , if the glasses exceed a certain length , the colours may be spread too wide to be capable of being admitted through the pu- pil or aperture of the eye ; which is the reason , that in long ...
... converge to a point on the retina ; yet , if the glasses exceed a certain length , the colours may be spread too wide to be capable of being admitted through the pu- pil or aperture of the eye ; which is the reason , that in long ...
الصفحة 213
... converge to , a point R , and pass through the plane sur- face PV , separating two refracting mediums AB , of which let B be the most refracting , and let RV be perpendicular to the surface . It is required to determine the point of ...
... converge to , a point R , and pass through the plane sur- face PV , separating two refracting mediums AB , of which let B be the most refracting , and let RV be perpendicular to the surface . It is required to determine the point of ...
عبارات ومصطلحات مألوفة
afterwards ancient angle of incidence apparent magnitude appear axis beautiful Bocchus body Cæsar called Catiline cause centre Cicero colour common concave contrary converge convex degree diameter discourse diverge Dr Hooke Elocution endeavour enthymem equal expression eye-glass fall farther feet figure focal distance focus former give glass greater ground hole honour inches incident rays inhabitants Jugurtha kind king length lens less likewise manner Mark Antony Masinissa means metonymy Micipsa microscope Milo mind nature nearer Nile Norway Numidia object object-glass obliquely observed occasion optic orator pass perpendicular person Plate prism produced proper quantity Quintilian racter rays of light reason reflected refracting telescopes refraction refrangible retina river Roman Rome says seen sentence shadow side sometimes species speculum subcaudal scales supposed surface Tarshish telescope thing tion tropes vision whole words
مقاطع مشهورة
الصفحة 77 - O, speak again, bright angel ! for thou art As glorious to this night, being o'er my head, As is a winged messenger of heaven Unto the white-upturned wond'ring eyes Of mortals, that fall back to gaze on him, When he bestrides the lazy-pacing clouds, And sails upon the bosom of the air.
الصفحة 108 - For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.
الصفحة 358 - And it came to pass at noon, that Elijah mocked them, and said, Cry aloud : for he is a god ; either he is talking, or he is pursuing, or he is in a journey, or peradventure he sleepeth, and must be awaked.
الصفحة 165 - But Jonah rose up to flee unto Tarshish from the presence of the Lord, and went down to Joppa; and he found a ship going to Tarshish : so he paid the fare thereof and went down into it, to go with them unto Tarshish from the presence of the Lord.
الصفحة 73 - If the world be promiscuously described, I cannot see of what use it can be to read the account; or why it may not be as safe to turn the eye immediately upon mankind as upon a ' mirror which shows all that presents itself without discrimination.
الصفحة 66 - Among the various reasons why we prefer one part of her works to another, the most general, I believe, is habit and custom : custom makes, in a certain sense, white black, and black white ; it is custom alone determines our preference of the colour of the Europeans to the .(Ethiopians, and they, for the same reason, prefer their own colour to ours.
الصفحة 42 - ... the sacrament of the Lord's Supper according to the usage of the Church of England...
الصفحة 73 - It is therefore not a sufficient vindication of a character that it is drawn as it appears; for many characters ought never to be drawn: nor of a narrative, that the train of events is agreeable to observation and experience; for that observation which is called knowledge of the world will be found much more frequently to make men cunning than good.
الصفحة 75 - ... while it is supported by either parts or spirit, it will be seldom heartily abhorred. The Roman tyrant was content to be hated, if he was but feared; and there are thousands of the readers of romances willing to be thought wicked, if they may be allowed to be wits. It is therefore to be steadily inculcated, that virtue is the highest proof of understanding, and the only solid basis of greatness; and that vice is the natural consequence of narrow thoughts, that it begins in mistake, and ends in...
الصفحة 73 - For this reason these familiar histories may perhaps be made of greater use than the solemnities of professed morality, and convey the knowledge of vice and virtue with more efficacy than axioms and definitions. But if the power of example is so great as to take possession of the memory by a kind of violence, and produce effects almost without the intervention of the will...