The Practical Astronomer: Comprising Illustrations of Light and Colours--practical Descriptions of All Kinds of Telescopes--the Use of the Equatorial-transit--circular, and Other Astronomical Instruments, a Particular Account of the Earl of Rosse's Large Telescopes, and Other Topics Connected with AstronomyClaxton, Remsen & Haffelfinger, 1869 - 369 من الصفحات |
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achromatic telescope angle aperture apparent magnitude appear astronomical atmosphere axis beautiful bodies camera obscura candle celestial centre circle clouds colours comet concave lens concave mirror consequently construction converge convex lens crown glass dark degree diameter direction distant objects distinct distinctly earth eclipse effect equal exhibited experiments eyeglass eyepiece figure flint glass fluid focal length formed glass globe half heavens horizon hundred inches focal distance instrument jects Jupiter lenses likewise luminous magnifying power magnitude millions of miles minutes moon motion move naked eye nature nearly object-glass observations optical orbit parallel rays pass perceived phenomena placed planet position produced proportion rays of light reflecting telescopes reflector refraction regions represented right ascension ring round satellites Saturn seen side solar space speculum stars substances sun's supposed surface tele terrestrial thousand tion tube Uranus Venus visible vision