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 . d look towards oneanother, and that the beam of light might fall uponboth the knives, and fome part of it pafs between theiredges. In this Ikuation he obferved, that when thediltance of their edges was about the 400th part of aninch, the dream divided in the m-ddle, and left a (ha-dow between the two parts. This ( was fo blackand dark, that ail the light which palled between thekni
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 . d look towards oneanother, and that the beam of light might fall uponboth the knives, and fome part of it pafs between theiredges. In this Ikuation he obferved, that when thediltance of their edges was about the 400th part of aninch, the dream divided in the m-ddle, and left a (ha-dow between the two parts. This ( was fo blackand dark, that ail the light which palled between theknives feemed to be bent and turned aiide to the onehand or the other; and as the knives dill approach-ed one another, the ibadow grew broader and thedreams lliorter next to it, till, upon the contact of dieknives, all light vanillied. From this experiment our author concludes, that thelight is leaft bent, and which gees to the inwardends of die dreams, palfes by the edges of the knivesat the greatelt drllance; and this diftance, when thefliadow began to appear between tlie dreams, wasabout the Scoth part ef an inch; and the light whichpalled by the edges of the knives at diftances dill lefs and 1. I G H iw I ^ li M 6 b: ?^rh/fnnr, fr. f Illflory. O I c s. ?And IcA. wasmm-e and miri f:i!nt, ;mJ we,u tf. tliofo fringes m;i(.lc bj the two edges of ih; knives rnnalo.:»parts ot Uk Itrcams which were larthcr from ihs Ji- the fjgc-s i f thi; of ilie ki:iv(;s, in ln?s p.!*.reft light; becuife, wlun the Itnives iippioachcJ i:*HcI lo chofe edges, vvsthout growing fenfurly aiicither till they ttuclieJ, ihofe pints of the er, till they met in angles eqiutl to the iiO^lc contuin-lli-i;im5 vauidicJ hifl which were ir. m the di- ed by the edgjs of the knives; a;id vvhei> thcytncl,rea ii-ht. _ and joined, they ended, without crollinT one an .thjr. In the experiment of one knife only, the But if the rnler w;is at a much greater diilancefri
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Keywords: ., bookcentury1700, bookdecade1790, bookidencyclopaedi, bookyear1798
