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Updated: May 13, 2025
There have been produced, and are now being studied, electromagnetic waves of four millimetres; and the gap subsisting in the spectrum between the rays left undetected by sylvine and the radiations of M. Lampa now hardly comprise more than five octaves that is to say, an interval perceptibly equal to that which separates the rays observed by M. Rubens from the last which are evident to the eye.
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