Spectacles: when to wear and how to use them1861 |
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achromatic lens achromatic telescope ADAM AND CHARLES adjusted angle angular astronomical axis axle centre CHARLES BLACK'S PUBLICATIONS cloth coloured rays concave lens construction convergence convex convex lens Crown 8vo crown glass Crown Lens curvature Delarue demy 8vo diameter disc dispersive power distance edition effect Encyclopædia Britannica equal Equatorial equatorial mounting eye-glass eye-lens eye-piece Fcap feet focus field of view figure flint focal length gilt edges glass grinding Herschel Huygenian Illustrations incidence Lassell Lassell's lenses lever light Lord Rosse magnifying power metal mounting movement Newtonian object object-glass optical parabolic parallel perfect Phil placed plane polisher portion practical prism radii radius reflected reflector reflexion refracting telescopes refractive index rendered revolve ring rotation Royal Observatory seen shewn side motion silver small mirror specula speculum speculum metal spherical aberration stroke surface tele thickness tion tube violet wheel
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67 페이지 - If half the transverse axis be subtracted from the distance between the focus and the middle of the said axis, the remainder will be the distance of the focus from the vertex. 3. The difference of two lines drawn from the two foci to any point in the curve, is equal to the transverse axis. 4. The parameter, latus rectum, or double ordinate at the focus, is equal to the square of the conjugate divided by the transverse. Note. Those who desire to obtain a complete knowledge of the properties of Conic...
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63 페이지 - ... the Huyghenian eye-piece, it lessens the spherical aberration by receiving the more refrangible at a less oblique incidence than the less refrangible rays. It will be obvious, that the nearer the interposed lens is to the objectglass, the less should its curvature be, but in proportion as the objectglass is approached, the difficulty of centering and defects in curvature become more felt ; if, again, the interposed lens be brought very near the eye-glass...
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