But the spectroscopes that can be employed for stellar spectroP graphs are not sufficiently powerful to separate fully lines which are very closely adjacent, and therefore a line, assumed to be of a known wave-length, may be apparently displaced by the near neighbourhood of an unknown line. [Please select]
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Engaging his tender "hopeful" in the wonders of astronomy--"Men have learned the distances of the stars," observed the father; "and, with their spectroscopes, found out what they are made of." [Please select]
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Observatories go up, telescopes, spectroscopes, photographic cameras are pointed and adjusted. [Please select]
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Startling indeed it is to the scientist to be told that an artificial dream-world of the mathematician is more real than that he sees with his galvanometers, ultra-microscopes, and spectroscopes. [Please select]
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