 | James Ferguson - 1764 - 322 pages
...much fhorter focal diftance than a refradting telefcope will j and, confequently, it will magnify fo much the more: for the rays are not coloured by reflection from a concave mirrour, if it be ground to a true figure, as they are by paffing through a convex-glafs, let it be... | |
 | James Ferguson - Astronomy - 1776 - 544 pages
...much fhorter focal diftance than a refracting telefcope will -, and, confequently, it will magnify fo much the more : for the rays are not coloured by reflection...mirror, if it be ground to a true figure, as they are by pafling through a convex-glafs, let it be ground ever fo true. The adjufting fcrew on the outfide of... | |
 | John Imison - Science - 1796 - 476 pages
...much fhqrter focal diftance than a refracting telefcope will ; and confequently it will magnify fo much' the more ; for the rays are not coloured by...If it be ground to a true figure, as -they 'are by paffing through a convex-glafs, let it be ground ever fo true. .' ' ..'••:-),' >..; . ,' • The... | |
 | Colin Macfarquhar, George Gleig - Encyclopedias and dictionaries - 1797
...much fnorter focal diftance than a refrafting telefcope will ; and confequently it will magnify fo much the more : for the rays are not coloured by reflection...mirror, if it be ground to a true figure, as they arc by paffinc; through a convex glafs, let it be ground ever fo true. The nearer an objeft is to the... | |
 | Thomas Hodson - Arithmetic - 1806 - 492 pages
...telefcopes magnify to a greater power. And the rays of light are not coloured by the reflections of the concave mirror, if it be ground to a true figure, as they are by paffing through a. convex glafs, though it be ground ever fa true. In thefe reflecting telefcopes,... | |
 | Thomas Hodson - Education - 1806
...magnify to a greater power. And the rays of light are not coloured by the reflections of the concare mirror, if it be ground to a true figure, as they are by pa/Ting through a convex glaft, though it be ground ever fo true. In thefe reflecting telefcopes, the... | |
 | Encyclopaedia Britannica - 1810 - 814 pages
...focal diflance than a refracting telefcope ; and confeqnently it will magnify fo much the more : fur the rays are not coloured by reflection from a concave...mirror, if it be ground to a true figure, as they are by paflmg through a convex glafs, let it be ground ever fo true. The nearer an object is to the telefcope,... | |
 | John Mason Good - 1819 - 744 pages
...(lie product of the latter, and the quotient will express the magnifying power. One great advantage if the reflecting telescope is. that it will admit of...to a true figure, as they are by passing through a convex glass, let it be ground ever so true. The nearer an object is to the telescope, the more its... | |
 | James Ferguson - Eclipses - 1823 - 406 pages
...practice is necessary before this exnarBnent can be made with accuracy. See Appendix, Vol. II— Ed. a refracting telescope will ; and, consequently, it...eyes, by bringing the small mirror either nearer to the eye, or removing it farther from it ; by which means, the rays are made to diverge a little for... | |
 | James Mitchell - Mathematics - 1823 - 684 pages
...former multiplication by the product of the latter, and the quotient will express the magnifying power. One great advantage of the reflecting telescope is,...a convex-glass, let it be ground ever so true. The nearer an object is to the telescope, the more its pencils of rays will diverge before they fall upon... | |
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... and, consequently, it will magnify so much the more ; for the rays are not coloured by reflection from a concave mirror, if it be ground to a true figure, as they are by passing through a convex-glass, let it be ground ever so true. 
