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action actual angle appearance applied astronomers atmosphere bearing body bright cause centre circle close clouds coloured consider consideration continuous corona corresponding course dark determine diameter direction disc distance Earth eclipse effect equal estimate evidence existence extend fact figure give greater heat Illustrating important increase indicate least length less light limb limits lines lunar matter means measure method miles minutes Moon Moon's motion nature nearly noticed object observations occur orbit pass photographs planets Plate portion position present prism probable problem produced prominences question rays reason recognised referred regarded regions relation remarkable represent researches respecting rotation round says seems seen shown side solar space spectroscope spectrum spots stars stations Sun's supposed surface theory tion transit true velocity Venus visible whole
Strona 405 - I have seen the wild stone-avalanches of the Alps, which smoke and thunder down the declivities with a vehemence almost sufficient to stun the observer. I have also seen snow-flakes descending so softly as not to hurt the fragile spangles of which they were composed ; yet to produce from aqueous vapour a quantity, which a child could carry, of that tender material, demands an exertion of energy competent to gather up the shattered blocks of the largest stone-avalanche I have ever seen, and pitch...
Strona 117 - I obtained a tolerably bright solar spectrum, and brought a flame coloured by sodium vapour in front of the slit. I then saw the dark lines D change into bright ones.
Strona 393 - The sun's rays are the ultimate source of almost every motion which takes place on the surface of the earth. By its heat are produced all winds, and those disturbances in the electric equilibrium of the atmosphere which give rise to the phenomena of lightning, and probably also to those of terrestrial magnetism and the aurora.
Strona 413 - ... melt in air, — the flux of power is eternally the same. It rolls in music through the ages, and all terrestrial energy, — the manifestations of life as well as the display of phenomena, are but the modulations of its rhythm.
Strona 193 - Herschel,'wouldcome,on this view of the subject, to be assimilated to those regions on the Earth's surface in which, for the moment, hurricanes and tornadoes prevail — the upper stratum being temporarily carried downwards, displacing by its impetus the two strata of luminous matter beneath...
Strona 412 - And still, notwithstanding this enormous drain in the lapse of human history, we are unable to detect a diminution of his store. Measured by our largest terrestrial standards, such a reservoir of power is infinite ; but it is our privilege to rise above these standards, and to regard the sun himself as a speck in infinite extension — a mere drop in the universal sea. We analyse the space in which he is immersed, and which is the vehicle of his power.
Strona 411 - Still, presented rightly to the mind, the discoveries and generalisations of modern science constitute a poem more sublime than has ever yet been addressed to the imagination. The natural philosopher of to-day may dwell amid conceptions which beggar those of Milton.
Strona 412 - To Nature nothing can be added ; from Nature nothing can be taken away ; the sum of her energies is constant, and the utmost man can do in the pursuit of physical truth, or in the...
Strona 204 - It was impossible, on first witnessing an appearance so similar to a sudden conflagration, not to expect a considerable result in the way of alteration of the details of the group in which it occurred; and I was certainly surprised, on referring to the sketch which I had carefully and satisfactorily (and I may add fortunately) finished before the occurrence, at finding myself unable to recognize any change whatever as having taken place.