Spectrum Analysis Explained ...: Including an Explanation of the Received Theory of Sound, Heat, Light, and Color |
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Spectrum Analysis Explained Including an Explanation of the Received Theory ... Dana Estes No preview available - 2012 |
Spectrum Analysis Explained ... Including an Explanation of the Received ... Heinrich Schellen,Dana Estes No preview available - 2015 |
Common terms and phrases
absorbed absorption according amount appears approach atmosphere August become blue bodies bright lines brilliant called cause changes cloud colors comet complete composed consists constitution contain continuous dark lines direction disk earth eclipse electric emitted entirely ether exist falling follows give glass greater green heat heavenly bodies hundred hydrogen impulses incandescent increased intense iron less light limb liquid luminous magnitude mass matter means metals meteors miles motion nature nebulæ November nucleus object observed obtained occur orbit particles pass period phenomena physical planets points portion position present prism produced prominences proved rapidity rays reflected remains remarkable ring round seen separate shower shows slit sodium solar spectrum solid sometimes sound space spectra spectroscope spectrum analysis spot stars substance sufficient sun's surface surrounded tail telescope thousand tion vapor various vibrations violet visible white light whole yellow
Popular passages
Page 173 - The meteors to which we owe the annual display of falling stars on the loth of August are not distributed equally along the whole course of their orbit ; it is still possible to distinguish the agglomeration of meteoric particles which originally formed the cometary nucleus from the other less dense parts of the comet; thus in the year 1862 the denser portion of this ring of meteors through which the earth passes annually on the...
Page 79 - ... the room at the moment when the rod is vibrating four times in a second. Neither eye nor ear tell me of the presence of the rod, only the hand which feels the strokes when brought within their reach. The vibrations become more rapid, till when they reach the number of thirty-two in a second, a deep hum strikes my ear. The tone rises continually in pitch, and passes through all the intervening grades up to the highest, the shrillest note, then all sinks again into the former grave-like silence....
Page 87 - ... light, in which occurs the celebrated sentence : " The relation between the power of emission and the power of absorption of one and the same class of rays is the same for all bodies at the same temperature" which will ever be distinguished as announcing one of the most important laws of nature, and which, on account of its extensive influence and universal application, will render immortal the name of its illustrious discoverer.
Page 131 - Jupiter.] attained that degree of density which must necessarily precede the formation of a solid surface. 61. SPECTRA OF THE FIXED STARS.* The fixed stars, though immensely more remote and less conspicuous in brightness than the moon and planets, yet from the fact of their being original sources of light furnish us with fuller indications of their nature. In all ages, and among every people, the stars have been the object of admiring wonder, and not unfrequently of superstitious adoration. The greatest...
Page 119 - Here one is reminded, by the fleecy, infinitely delicate cloud-films, of an English hedge-row with luxuriant elms ; here of a densely intertwined tropical forest, the intimately interwoven branches threading in all directions, the prominences generally expanding as they mount upwards, and changing slowly, indeed almost imperceptibly.
Page 141 - ... is hydrogen. The great brightness of these lines shows that the luminous gas is hotter than the photosphere. These facts, taken in connection with the suddenness of the outburst of light in the star, and its immediate very rapid decline in brightness from the second magnitude...
Page 98 - AND THEIR SPECTRA. It would lead us too far from our subject were we to dwell upon the phenomena of the solar spots, important as they are for acquiring a knowledge of the physical constitution of the sun, or enter upon a full description of their form, their mode of formation and disappearance, their motion, their connection with the sun's rotation...
Page 172 - ... appears only once in our system, and then returns to wander in the realms of space; in the former case, it abides with us, and accomplishes its course round the sun, like the planets, in a certain fixed period of years. From this it is evident that the orbits of comets may occur at every possible angle to that of the earth, and that their motion will be sometimes progressive and sometimes retrograde. The history of the cosmical cloud does not, however, end with its transformation into a comet....