I made in a piece of Lead a small Hole with a Pin, whose breadth was the 42th part of an Inch.įor 21 of those Pins laid together took up the breadth of half an Inch. For the circum stances of the Phænomenon, so far as I have observed them, are as follows. These broad shadows and fringes have been reckoned by some to pro ceed from the ordinary refraction of the Air, but with out due examination of the matter. But if the Hole be enlarged the fringes grow broad and run into one ano ther, so that they cannot be distinguished. G Rimaldo has informed us, that if a beam of the Sun's Light be let into a dark Room through a very small Hole, the shadows of things in this Light will be larger than they ought to be if the rays went on by the Bodies in streight Lines, and that these sha dows have three parallel fringes, bands or ranks of co loured Light adjacent to them.
Editorial interventions are applied to expand abbreviations and correct textual mistakes. Normalized transcriptions provide a tidied-up view of the original text. You are currently reading the normalized version of this text.Also Two treatises of the Species and Magnitude of Curvilinear Figures (London: 1704).
Source: Opticks: Or, A treatise of the Reflections, Refractions, Inflexions and Colours of Light.
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