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 . ^ with a force repre-fented by the area A/CDE, and in the oppofitedireflion by the particles in E? with a force re-prefented by the area Yf DE. This balances anequal quantity of aflion, and there remains an aflionexpreied by the area AiC/ F. Therefore, if an equaland fimilar line to A/5CDE bedefcribed on the aifcilfaEB, the of a medium on particle of lightin c be repref.
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 . ^ with a force repre-fented by the area A/CDE, and in the oppofitedireflion by the particles in E? with a force re-prefented by the area Yf DE. This balances anequal quantity of aflion, and there remains an aflionexpreied by the area AiC/ F. Therefore, if an equaland fimilar line to A/5CDE bedefcribed on the aifcilfaEB, the of a medium on particle of lightin c be by the area <?y^<,6B, lying be-yond i. If we no draw a Ine AELMRNPB whofe ordl-nitesCIv, FQ^, cR, &c. are as die areas of the othercurve, cllirnated iiom A and B; thefe .oriinates willreprelent tl;e-whole force-; which are cxefteti -by-theparicles in E3, on a parti le of light m, vjng from Ato B. This curve will cut the a;.is in points L, Nfuch, d)at the ordinates drawn dirough them iiircv-cept are IS of the firfl cu:ve, which are equal eachfide of the attis; and in thefe points the particle of hghtfuftainsno aflion from themiedium. Thefe points are very 0 p r I ( s. Ilalo ( Trr>if/tnnt Part I. Caufs ofRcfradion OPTICS. CCCLlV, 140 1 aws ol re-fr3»5llon invl-ne fur-fuces. very fiom the fimlhir points of the curve ex-prcffliv); the aftion of ;i fingle particb. Thefe lall arein the very phices where the light fiiftains the gre;n-eft repullive ailion of the whole row of particles. Inthe farre manner may a curve be c ^nftiu-teJ, whiifcordiuates cxprels the riniteJ action of the whole me-dium. From thef. obfevrat-cns we learn in general, that afaricle of hglit wihin the fpace of aflin is (nwith equal forces, and i:i the lame direiftion, when atequal dillances on each fids of the furface of the me-diui;i. Of the focal clijlaiice of rays rfracli I by pafnr out of onemtd:um into of diff-nnt dcnfty and thruugb aplane Jut fuse. LcmmLU
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Keywords: ., bookcentury1700, bookdecade1790, bookidencyclopaedi, bookyear1798
