Familiar Lectures on Scientific SubjectsGeorge Routledge & Sons, 1869 - 507 pages |
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action æther amount angle of incidence aperture appear astronomers axis body bright calculation called centre circle circular cloud coloured comet course crystal dark diameter direction distance double refraction double stars earth earthquake elastic elliptic equal fact feet force fringes glass globe heat Iceland spar illumination inch incidence instance intensity interval lava length less light luminiferous ether luminous matter measure medium metre miles minute molecules moon motion movement nature nearly object oblique observed optical orbit parallax parallel particles pass perihelion perpendicular phænomena phænomenon plane plate polarized portion prism prismatic produce propagated proportion reflected reflexion refracted ray refraction refractive index result retina right angles rings round screen seen shadow side space spectrum star Sumbawa sun's suppose surface tail telescope theory thickness tints tion tourmaline undulation undulatory vapour velocity Vesuvius vibrations vis viva volcano wave weight whole