Abstract
IN school and college courses little experimental work is done on the infra-red and ultra-violet parts of the spectrum. The student is, of course, told about these regions, and how they can be detected respectively by the heating and actinic properties of their rays. But he is not allowed to. investigate these rays himself, nor are their properties demonstrated before him. This is on account of the elaborate nature of the apparatus necessary; the infrared region requires a thermopile or bolometer, together with an expensive galvanometer, and the ultraviolet requires photographic methods and a spectrograph. So much apparatus cannot be afforded for one experiment, and besides is apt to distract the student's attention from the simple nature of the facts involved.
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HOUSTOUN, R. An Experiment on the Spectrum. Nature 105, 421–422 (1920). https://doi.org/10.1038/105421b0
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DOI: https://doi.org/10.1038/105421b0
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