| William Kitchiner - 1825
...what he wished to have done, he first shewed the are used, the power of a glass is readily discovered **by dividing the focal length of the object-glass by that of the eye-glass,** in eye-pieces ot the common construction, especially those of a negative focus, it is very difficult... | |
| Leonhard Euler, Sir David Brewster - 1833
...ratio of Ihe magnifying power. When single lenses are used, the power of a glass is readily discovered **by dividing the focal length of the object-glass by that of the** eye-glan.— Am. Ett, piu^eu by near-sighted persons, which represents the images of objects at a very... | |
| Golding Bird - 1839 - 120 pagine
...the same means as in the case of compound microscopes (367). The magnifying power of these telescopes **is found by dividing the focal length of the object-glass by that of the eye-glass.** 570. If a concave eye-glass be substituted for the lens CD in the last-described instrument, we have... | |
| Thomas Dick - 1845
...the focus of the eye-glass to be 1 inch, the magnifying power will be 10 times — which is always **found by dividing the focal length of the object-glass by that of the eye-glass.** The interval between the two glasses, in this case, will be 9 inches, which is the length of the telescope,... | |
| Thomas Dick - 1845 - 567 pagine
...the focus of the eye-glass to be 1 inch, the magnifying power will be 10 times — which is always **found by dividing the focal length of the object-glass by that of the eye-glass.** The interval between the two glasses, in this case, will be 9 inches, which is the length of the telescope,... | |
| Golding Bird - 1848 - 552 pagine
...by the same means as in the case of compound microscopes. The magnifying power of these telescopes **is found by dividing the focal length of the object-glass by that of the eye-glass.** 756. If a concave eye-glass be substituted for the lens CD in the last-described instrument, we have... | |
| Natural philosophy - 1850
...large field and a distinct view. This may therefore be properly called the terrestrial telescope. Its **magnifying power is found by dividing the focal length of the object-glass by that of the** single lens equivalent to the eye-piece. The magnifying power may be increased by enlarging the distance... | |
| Thomas Dick - 1850
...and the focus of the eyeglass to be one inch, the magnifying power will be ten times, which is always **found by dividing the focal length of the object-glass by that of the eyeglass.** The interval between the two glasses, in this case, will be nine inches, which is the length of the... | |
| Golding Bird, Charles Brooke - 1867 - 851 pagine
...tlinse employed in the construction of compound microscopes. The magnifying power of these telescopes **is found by dividing the focal length of the object-glass by that of the eye-glass.** 1170. In the refracting telescope as ordinarily constructed, the erecting glasses are interposed between... | |
| Edward Nugent - 1870 - 268 pagine
...containing the eye-glass which he held in his hand. The magnifying power of the astronomical telescope **is found by dividing the focal length of the object-glass by that of the eye-glass.** The Galilean Telescope. — This telescope, which was the one used by the illustrious Galileo, from... | |
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