 | Charles A. Long - 1861 - 228 pages
...results in the production of specula 13 inches in aperture and 10 feet focal length, the perfection of which is enhanced by his practice of bestowing...polisher for itself on every occasion of repolishing. For this part of his system of working he acknowledges his obligations to Mr. Nasmyth, who has also... | |
 | John F. W. Herschel - Telescopes - 1861 - 208 pages
...results in the production of specula 1 3 inches in aperture and 10 feet focal length, the perfection of which is enhanced by his practice of bestowing...polisher for itself on every occasion of repolishing. For this part of his system of working he acknowledges his obligations to Mr. Nasmyth, who has also... | |
 | Astronomy - 1862 - 368 pages
...results in the production of specula i 3 inches in aperture and io feet focal length, the perfection of which is enhanced by his practice of bestowing...polisher for itself on every occasion of repolishing." In a more private communication to myself on the same subject, Sir John adds that, " Mr. De La Rue's... | |
 | Astronomy - 1862 - 356 pages
...results in the production of specula 1 3 inches in aperture and 10 feet focal length, the perfection of which is enhanced by his practice of bestowing...polisher for itself on every occasion of repolishing." In a more private communication to myself on the same subject, Sir John adds that, " Mr. De La Rue's... | |
 | Smithsonian Institution. Board of Regents - Discoveries in science - 1862 - 486 pages
...perfection of which is enhanced by his practice of bestowing the same care and precision on every step of figuring of the speculum, from the grinding, the smoothing...of slate cut into squares, carefully brought to the Kame figure, and to the figuring of the polisher itself, which being thus previously rendered almost... | |
 | Smithsonian Institution. Board of Regents - Discoveries in science - 1862 - 492 pages
...perfection of which j^ enhanced by his practice of bestowing the same care and precision on every step of figuring of the speculum, from the grinding, the smoothing...polisher for itself on every occasion of repolishing." In a more private communication to myself on the same subject. Sir John adds that "Mr. De La Rue's... | |
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Rue's mechanism, which has afforded very admirable results in the production of specula 1 3 inches in aperture and 10 feet focal length, the perfection of which is enhanced by his practice of bestowing the same care and precision on every step of the... 