 | David Brewster - 1831 - 412 pages
...are curves of this kind, in which the curvature diminishes from n to L ; and mathematicians •ive shown how spherical aberration may be entirely removed,...lenses whose sections are ellipses or hyperbolas. This curious discovery we owe to Descartes. Fig. 38. If ALDL, for example, is an ellipse whose greater... | |
 | Denison Olmsted - 1832 - 402 pages
...the ellipse and hyperbola are curves of this kind, in which the curvature diminishes from n to L ; and mathematicians have shown how spherical aberration...lenses whose sections are ellipses or hyperbolas. Of a lens of this kind we will annex one example. 899. A lens in the form of a spheroid (generated... | |
 | Denison Olmsted - 1832 - 378 pages
...and diminish it gradually towards L, we should remove the spherical aberration. But the ellipse and hyperbola are curves of this kind, in which the curvature diminishes from n to L ; and mathematicians have shown how spherical aberration may be entirely removed, by lenses... | |
 | Denison Olmsted - 1835 - 374 pages
...and diminish it gradually towards L, we should remove the spherical aberration. But the ellipse and hyperbola are curves of this kind, in which the curvature diminishes from n to L ; and mathematicians have shown how spherical aberration may be entirely removed, by lenses... | |
 | David Brewster - 1841 - 432 pages
...convexity at n and diminish it gradually towards L, we should remove the spherical aberration. But the ellipse and the hyperbola are curves of this kind, in which the curvature diminishes from n to L; and mathematicians have shown how spherical aberration may be entirely removed, by lenses whose... | |
 | William Mackenzie - 1841 - 326 pages
...curves of such a nature that their curvature diminishes from m to L ; and it was shown by Des Cartes* how spherical aberration may be entirely removed by...lenses whose sections are ellipses or hyperbolas. Thus, if A L' M L', fig. 61, be an ellipse, whose major axis, AM, is to the distance between the foci,... | |
 | Jabez Hogg - 1854 - 550 pages
...the meniscus form of lens, which is shown to be the segment of an ellipsoid instead of a sphere. But the ellipse and the hyperbola are curves of this kind,...from the central ray, or axis, to the circumference b; and mathematicians have shown how spherical aberration may be entirely removed by lenses whose sections... | |
 | Jabez Hogg - 1854 - 516 pages
...this kind, in which the curvature diminishes from the central ray, or axis, to the circumference b ; and mathematicians have shown how spherical aberration...lenses whose sections are ellipses or hyperbolas. This curious discovery we owe to Descartes. If a I, al for example, fig. 10, be part of an ellipse... | |
 | Jabez Hogg - 1856 - 532 pages
...the meniscus form of lens, which is shown to be the segment of an ellipsoid instead of a sphere. But the ellipse and the hyperbola are curves of this kind,...lenses whose sections are ellipses or hyperbolas. This curious discovery we owe to Descartes. If a I, a I' for example, fig. 10, be part of an ellipse... | |
 | Jabez Hogg - 1856 - 530 pages
...the meniscus form of lens, which is shown to he the segment of an ellipsoid instead of a sphere. But the ellipse and the hyperbola are curves of this kind,...from the central ray, or axis, to the circumference b ; and mathematicians have shown how spherical aberration may be entirely removed by lenses whose... | |
| |
... and mathematicians have shown how spherical aberration may be entirely removed by lenses whose sections are ellipses or hyperbolas. This curious discovery we owe to Descartes. If a I, a I 
