 | Isaac Newton - 1730 - 432 pages
...Axis I turned the Prifm flowly, and faw the refradted Light on the Wall, or coloured Image of the Sun, firft to defcend, and then to afcend. Between the Defcent and Afcent, when the Image feemed Stationary, I ftopp'd the Prifm, and fix'd it in that Pofture, that it mould be moved no more. For... | |
 | Robert Smith - 1738 - 402 pages
...experiments perpendicular to the incident rays. About this axis I turned the prifm flowly, and faw the refracted light on the wall, or coloured image of the fun, firfl to defcend, and then to afcend. Between the defcent and afcent when the image feemed flationary,... | |
 | William Emerson - 1768 - 444 pages
...SF. Turn the prifm Qowly 4. about the axis, and you will fee the refracted light on the wall, or the coloured image of the fun, firft to defcend, and then to afcend. Between the defccnt and afcent, when the image feems fbtionary, ftop the prifm and fix it there. For in that pofture... | |
 | George Gregory - 1796 - 620 pages
...perpendicular to the incident rays. About this axis I turned the prifm flowly, and faw the refrafted light on the wall, or coloured image of the fun, firft...afcend. Between the defcent and afcent, when the image fcemed ftationary, I flopped the prifm and fixed it in that pofture. ' Then I let the refracted light... | |
 | Colin Macfarquhar, George Gleig - 1797 - 450 pages
...perpendicular to the incident rays. About this axis I turned the prifm (lowly, and faw the refrafted light on the wall, or coloured image of the fun, firft...Between the defcent and afcent, when the image feemed ilationary, I (lopped the prifm and fixed it in that pollute. " Then I let the refrafted light fall... | |
 | 1816 - 778 pages
...experiments perpendicular to the incident rays. About this axis I turned the prifm (lowly, and faw the refracted light on the wall, or" coloured image of the fun, firft to defcend, ar.d then to afcend. Between the defcent and afcent, when the image feemed ftationary, I ftopi.ed the... | |
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... through the middle of the prifm, from one end of it to the other end, parallel to the edge of the refracting angle) was in this and the following experiments perpendicular to the incident rays. About this axis I turned the prifm flowly, and faw the... 