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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. "
Ferguson's Lectures on Select Subjects, in Mechanics, Hydrostatics ... - Page 267
by James Ferguson - 1814
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Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and ..., Volume 15

Encyclopedias and dictionaries - 1823 - 886 pages
...that it will admit of an eye-glass of a/ much shorter focal distance than a refracting telescope ; and consequently it will magnify 'So much the more:...to a true figure, as they are by passing through a convex glassy let it be- ground ever so true. The nearer an object is to the telescope, the more its...
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Lectures on Select Subjects in Mechanics, Hydrostatics, Pneumatics, Optics ...

James Ferguson - Astronomy - 1839 - 554 pages
...prevented its useful application. Mir are ""'• r"l"lirt'(l by reflection from a concave mirror, if v"' it be ground to a true figure, as they are by passing...eyes, by bringing the small mirror either nearer to the eye, or removing it farther : by which means, the rays are made to diverge a little for short-sighted...
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The practical astronomer, comprising illustrations of light and colours [&c.].

Thomas Dick - 1845 - 608 pages
...refractors, is, that they will admit of eye glasses of a much shorter focal distance, and consequently, will magnify so much the more, for the rays are not...to a true figure, as they are by passing through a convex glass though figured and polished with the utmost exactness. It will be perceived from the above...
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The Practical Astronomer

Thomas Dick - Astronomical instruments - 1845 - 644 pages
...refractors, is, that they will admit of eye glasses of a much shorter focal distance, and consequently, will magnify so much the more, for the rays are not...to a true figure, as they are by passing through a convex glass though figured and polished with the utmost exactness. It will be perceived from the above...
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The Complete Works of Thomas Dick, Volume 3

Thomas Dick - Educational sociology - 1850 - 586 pages
...refractors is, that they will admit of eyeglasses of a much shorter focal distance, and, consequently, will magnify so much the more, for the rays are not...to a true figure, as they are by passing through a convex glass, though figured and polished with the utmost exactness. It will be perceived from the...
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