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 AstronomyE.C. & J. Biddle, 1856 - 396 sider |
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achromatic telescope adjusted altitude angle apparent magnitude appear astronomical atmosphere axis beautiful bodies camera obscura candle celestial centre circle colours concave lens concave mirror construction converging convex lens crown glass dark degree direction distant objects distinctly double double stars earth effect equal equatorial exhibits experiment eyeglass eyepiece figure fixed flint glass focal length formed glass globe half heavens horizon inches aperture inches diameter inches focal distance instrument invention Jupiter lenses likewise luminous magnifying power metal miles minutes moon motion naked eye nature nearly object-glass observations observatory optical parallel rays pass perceived phenomena placed planet polished position prism produced proportion radius rainbow rays of light reflecting telescopes reflector refraction represented right ascension ring satellites Saturn seen side solar space spectrum specula speculum stars sun's supposed surface tele terrestrial tion tube Uranus Venus violet visible wheel
Populære passager
Side 20 - Or hear'st thou rather pure ethereal stream, Whose fountain who shall tell ? before the sun, Before the heavens thou wert, and at the voice Of God, as with a mantle, didst invest The rising world of waters dark and deep, Won from the void and formless infinite.
Side 121 - As the appearance of the bow that is in the cloud in the day of rain, so was the appearance of the brightness round about. This was the appearance of the likeness of the glory of the Lord.
Side 19 - Bright effluence of bright essence increate. Or hear'st thou rather pure ethereal stream, Whose fountain who shall tell? before the sun, Before the heavens thou wert, and at the voice Of God, as with a mantle, didst invest...
Side 121 - And it shall come to pass, when I bring a cloud over the earth, that the bow shall be seen in the cloud: 15 and I will remember my covenant, which is between me and you and every living creature of all flesh; and the waters shall no more become a flood to destroy all flesh.
Side 293 - ... objects. Our sight seems designed to supply all these defects, and may be considered as a more delicate and diffusive kind of touch, that spreads itself over an infinite multitude of bodies, comprehends the largest figures, and brings into our' reach some of the most remote parts of the universe...
Side 136 - Besides, the Jews and other ancient nations as well as modern Europeans have adopted the division of the week into seven days, and have named them from the seven planets : now if we increase the number of the planets this whole system falls to the ground.
Side 121 - Look upon the rainbow, and praise him that made it; very beautiful it is in the brightness thereof. It compasseth the heaven about with a glorious circle, and the hands of the most High have bended it.
Side 121 - And immediately I was in the spirit; and behold, a throne was set in heaven, and one sat on the throne ; and he that sat was to look upon like a jasper and a sardine stone ; and there was a rainbow round about the throne, in sight like unto an emerald.
Side 122 - ... while the Earth remaineth seed-time and harvest, and cold and heat, and summer and winter, and day and night shall not cease.
Side 135 - Oh, my dear Kepler," says Galileo, " how I wish that we could have one hearty laugh together. Here, at Padua, is the principal professor of philosophy, whom I have repeatedly and urgently requested to look at the moon and planets through my glass, which he pertinaciously refuses to do.