Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of . l be different in different bo- dies. But in all bodies there will be tlris general re-femblance, that the feparation will be moft cspiousin great obliquities of incidence, which g vei the re-puillve forces more time for aaion, while it dimi-nlfhcs the perpendiVAilWr force of the 11 ht. Such arefcmblance hetweefi the phenomena and the legiti-mate coaiequencesi bf the aifumption (the agita
Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of . l be different in different bo- dies. But in all bodies there will be tlris general re-femblance, that the feparation will be moft cspiousin great obliquities of incidence, which g vei the re-puillve forces more time for aaion, while it dimi-nlfhcs the perpendiVAilWr force of the 11 ht. Such arefcmblance hetweefi the phenomena and the legiti-mate coaiequencesi bf the aifumption (the agitationof the parts of the body), gives us fome authority nerality. not doubting but that tbtfe points of re-femblance will lead to the difcovery of their the experimeirts of Mr Bouguei lliow that bo-dies differ extiemely in their powers of thus fepa-rating light by reflection and refraaion, fome of ithenirellcairg much taiore at a- given angle thail is not ihSfeiore a genera! property of light to he partlyrefleaed and partly refraaed, Ijut a diJimBive pro- perty of dijcrait bodies; and fines ice that they for affignlng this as the caaie; nor can the aifump- tion Plate f((I,\ III. TffTF^ rr^tir/jtire fr, ^\ Vait I. Caufe ofRtfliiSHon, 179 /nothi rHyputliefi OPT tinn I)C called grnfuitous. To fupp^fe that tlie par-ticles of the tranipiiix-nt body are not thus agUaled, wouldbe a rnoft gratuitous contradiction of a law of natureto wliich we know no otlicr exception. Thus the olijeflion raifed in n° 132, is obviated,becaufe the rtfloflion and refradlion is not here con-ceived as fimukancous, but as fucceflive. I 307 thicker body ; for the li^jht rcflefled from thence is L alfo obfervcd to be coloured, and to form rin^s ac- ^^^ ^ cording to the different thicknefs of the body, not intermixed and conft unded with other light, as will appear fiom the followins; experiment.^ If a piece of glafs be ground concave on one fide and convex on the other, both its
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Keywords: ., bookcentury1700, bookdecade1790, bookidencyclopaedi, bookyear1798
