The practical astronomer, comprising illustrations of light and colours [&c.].1845 |
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Frases i termes més freqüents
achromatic telescope adjusted altitude angle apparent magnitude appear astronomical atmosphere axis beautiful Camera Obscura candle celestial centre circle colours concave lens concave mirror construction converging convex lens crown glass dark degree direction distant objects distinctly Ditto Dollond double double stars earth effect equal exhibited experiments eye-glass eye-piece feet focal field of view figure flint glass fluid focal length Gregorian half heavens hole horizon image formed inches aperture inches diameter inches focal distance inches focus instrument invention Jupiter lenses likewise magnifying power magnitude metal minute moon motion nature nearly Newtonian telescope object-glass observed optical opticians parallel rays pass perceived piece placed planets polished position principle prism produced proportion radius rays of light reflecting telescopes reflector refraction represented Right Ascension satellites Saturn seen side solar space specula speculum stars sun's supposed surface tance teles terrestrial objects tion tube violet visible
Passatges populars
Pàgina 5 - 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.
Pàgina 158 - 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.
Pàgina 159 - 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.
Pàgina 182 - 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.
Pàgina 180 - 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.
Pàgina 158 - 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.
Pàgina 109 - ... numberless series of pilasters, arches, castles well delineated, regular columns, lofty towers, superb palaces, with balconies and windows, extended alleys of trees, delightful plains with herds and flocks, armies of men on foot and horseback, and many other strange figures in their natural colors and proper actions, passing rapidly in succession along the surface of the sea, during the whole of the short period of time while the above-mentioned causes remain.
Pàgina 222 - The magnifying power of a telescope of this construction is found by dividing the focal distance of the object-glass by the focal distance of the eye-glass. Thus, if the...
Pàgina 181 - There are seven windows given to animals in the domicile of the head, through which the air is admitted to the tabernacle of the body, to enlighten, to warm and to nourish it. What are these parts of the microcosmos: Two nostrils, two eyes, two ears and a mouth.
Pàgina 159 - ... while the Earth remaineth seed-time and harvest, and cold and heat, and summer and winter, and day and night shall not cease.