The Practical Astronomer: Comprising Illustrations of Light and Colours--practical Descriptions of All Kinds of Telescopes--the Use of the Equatiorial Transit, Circular, and Other Astronomical Instruments; a Particular Account of the Earl of Rosse's Large Telescopes and Other Topics Connected with AstronomyBiddle, 1848 - 396 síður |
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Aðrar útgáfur - View all
Common terms and phrases
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 glass globe half heavens horizon inches aperture inches diameter inches focal distance instrument invention jects 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 round satellites Saturn seen side solar space spectrum specula speculum stars sun's supposed surface tele terrestrial tion tube Venus violet visible wheel
Vinsælir kaflar
Síða 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.
Síða 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.
Síða 295 - ... 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...
Síða 19 - Or of the eternal co-eternal beam, May I express thee unblamed ? since God is light, And never but in unapproached light Dwelt from eternity, dwelt then in thee, 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...
Síða 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.
Síða 122 - ... while the Earth remaineth seed-time and harvest, and cold and heat, and summer and winter, and day and night shall not cease.
Síða 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.
Síða 88 - ... 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.
Síða 163 - 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...
Síða 52 - At first they could not be persuaded of the reality of the appearance ; but they soon became so thoroughly convinced, by the cliffs gradually appearing more elevated, and approaching nearer, as it were, that they pointed out, and named to me, the different places they had been accustomed to visit ; such as the Bay, the Old Head or Man, the Windmill, &c. at Boulogne ; St. Vallery, and other places on the coast of Picardy ; which they afterwards confirmed, when they viewed them through their telescopes.