Encyclopaedia Perthensis; Or Universal Dictionary of the Arts, Sciences, Literature, &c. Intended to Supersede the Use of Other Books of Reference, Tom 16John Brown, 1816 |
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Strona 321
... rays fall upon is a tranfparent fubftance , at the furface of which one part of the light is al- ways reflected and another refracted . But he feems to confider refraction as ferving only to condenfe the light , and thereby enabling it ...
... rays fall upon is a tranfparent fubftance , at the furface of which one part of the light is al- ways reflected and another refracted . But he feems to confider refraction as ferving only to condenfe the light , and thereby enabling it ...
Strona 323
... rays of light come from the tops of them , to our eyes , in ftraight lines , muft , he fays , be very erroneous . Dr Hooke gives a very good account of the TWINKLING OF THE STARS ; afcribing it to the irregular and unequal refrac- tion ...
... rays of light come from the tops of them , to our eyes , in ftraight lines , muft , he fays , be very erroneous . Dr Hooke gives a very good account of the TWINKLING OF THE STARS ; afcribing it to the irregular and unequal refrac- tion ...
Strona 324
... rays of light have different degrees of refrangibility , it neceffarily follows , that the rules laid down by preceding philofophers con- cerning the refractive power of water , glass , & c . muft be limited to the middle kind of ray ...
... rays of light have different degrees of refrangibility , it neceffarily follows , that the rules laid down by preceding philofophers con- cerning the refractive power of water , glass , & c . muft be limited to the middle kind of ray ...
Strona 325
... rays of every fort , made out of any medium into air , are known by having the re- fraction of the rays of any one fort ; and alfo that the refraction out of one medium into another is found as often as we have the refractions out of ...
... rays of every fort , made out of any medium into air , are known by having the re- fraction of the rays of any one fort ; and alfo that the refraction out of one medium into another is found as often as we have the refractions out of ...
Strona 326
... rays . 39. In a letter to M. KLINGENSTIERNA , quot- ed by M. Clairaut , Mr Dollond fays , that the fine of incidence in crown glass is to that of its general refraction as I to r53 , and in flint glafs as 1 to 1583. To apply this to ...
... rays . 39. In a letter to M. KLINGENSTIERNA , quot- ed by M. Clairaut , Mr Dollond fays , that the fine of incidence in crown glass is to that of its general refraction as I to r53 , and in flint glafs as 1 to 1583. To apply this to ...
Kluczowe wyrazy i wyrażenia
againſt alfo almoft alſo ancient angle angle of incidence appear becauſe Bocchus body brafs cafe called caufe cauſe centre coaft coins colour confequently confiderable confifts defcribed denarius difcovered diftance Dr Hooke Dryden equal faid fame fays feems feen fent feveral fhadow fhall fhould fide filver fince firft firſt fituated fize fmall focus fome fometimes foon fquare ftate ftill ftone fubftance fubject fuch fuppofed furface Gallienus glafs glaſs himſelf houſe incident rays increaſe inftrument interfection iſland itſelf Jugurtha king laft lefs light likewife meaſure medals miles SW moft moſt motion muft muſt Norway Numidia obferved object occafion oppofite paffing parallel perfon prefent prifm purpoſe reafon reflected refraction reft retina rifes river Roman Ruffia ſeveral Shak ſmall ſpace teleſcope thefe themſelves theſe thofe thoſe tion town of France town of Sweden uſed whofe
Popularne fragmenty
Strona 86 - Farewell! a long farewell, to all my greatness! This is the state of man: today he puts forth The tender leaves of hope; tomorrow blossoms, And bears his blushing honours thick upon him; The third day comes a frost, a killing frost, And when he thinks, good easy man, full surely His greatness is a-ripening, nips his root, And then he falls, as I do.
Strona 44 - The change of motion is proportional to the motive force impressed ; and is made in the direction of the right line in which that force is impressed.
Strona 43 - Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Strona 149 - Vice, for vice is necessary to be shewn, should always disgust.} nor should the graces of gaiety, or the dignity of courage, be so united with it as to reconcile it to the mind. Wherever it appears, it should raise hatred by the malignity of its practices, and contempt by the meanness of its stratagems ; for while it is supported by either parts or spirit, it will be seldom heartily abhorred.
Strona 296 - When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart.
Strona 52 - ... an equal reaction; therefore the planet B will, on the other hand, gravitate towards all the parts of the planet A; and its gravity towards any one part will be to the gravity towards the whole as the matter of the part to the matter of the whole. QED Cor.
Strona 149 - The purpose of these writings is surely not only to show mankind, but to provide that they may be seen hereafter with less hazard ; to teach the means of avoiding the snares which are laid by TREACHERY for INNOCENCE, without infusing any wish for that superiority...
Strona 41 - Absolute, true, and mathematical time, of itself, and from its own nature, flows equably without relation to anything external, and by another name is called duration: relative, apparent, and common time, is some sensible and external (whether accurate or unequable) measure of duration by the means of motion, which is commonly used instead of true time; such as an hour, a day, a month, a year.
Strona 42 - The effects which distinguish absolute from relative motion are the forces of receding from the axis of circular motion. For there are no such forces in a circular motion purely relative, but in a true and absolute circular motion they are greater or less, according to the quantity of the motion.
Strona 149 - 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.