Word: spectra
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...great stars-Rigel, Vega, Sirius, Procyon, Capella, Aldebaran, Betelgeuse, Alpha Herculis, Beta Pegasi. He employs the Nichols radiometer, a delicate instrument worked by heat, like the little vanes revolved by sunlight in optician's windows. The stars' light is broken up by the spectroscope into their respective spectra or color bands, the heat in the different parts of which can be measured. These stars represent all the main types, from blue...
...expected that the heat from stars of the same color type would be greatest in the same parts of their spectra, but surprising differences were found. Vega and Sirius are both blue-white stars, but the maximum heat of Vega is much farther toward the violet than that of Sirius. Rigel (blue) shows two maxima, one of which is in the infrared rays, invisible to the human eye. The apparatus detects differences of a hundred-millionth of a degree of heat. That is not enough, say the astronomers. It must be sharpened to a thousand-millionth, and many fainter stars...
...they would not prevent electrons falling into the nucleus. These move in fixed orbits and new ones cannot be created. When atoms are bombarded by free electrons, the electron rebounds or transfers its energy to the atom, in which case there is an emission of light in the spectra. Sir Oliver Lodge, in his installation address as President of the Roentgen Society, London, outlined his own version of atomic theory. The nucleus he believes to be rotating at the speed of light. Surrounding it is ether, stratified into gravitational or electric levels. Electrons moving in these planes counter-balance...
...Physical Colloquium meeting this afternoon at 5 o'clock in room 3 of the Jefferson Physical Laboratory. Professor F. A. Saunders of the Physics Department will speak on "Series Spectra of Ionised Elements". The meeting will be open to members of the University...
Over 300 people crowded the large room of Jefferson Physical Laboratory yesterday afternoon to hear Professor Niels Bohr of the University of Copenhagen give the first of his lectures on the theory of spectra and atomic constitution. Professor Bohr, who has won international reputation in connection with the theory of atomic constitution, in his lecture yesterday explained the model atom which he has invented...