IN the first place, then, what does the spectroscope tell us with regard to the radiation from the sun and the stars? And here I ask you to neglect and banish from your minds for a time any idea of ...

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IN 1933 Cleeton and Williams 1 observed a broad absorption band in ammonia at atmospheric pressure in the region of 1 cm. wave-length ; this is attributed to the 'inversion' of the pyramidal ammonia ...