<< ...Nel 1922 nel laboratorio della National Electric Light di Cleveland nello stato dell'Ohio [715] , Ernest Fox Nichols, director of laboratory research and his assistant James de Graff obtained with a Tear electrical oscillator special reduced size of very short radio waves of 220 u, shorter than the radiation emitted by a mercury lamp dall'incandescenza-quartz and obtained some years earlier by Heinrich Rubens and Otto von Baeyer [716] .
In scientific literature the experiment of 1922 is cited as the definitive test of the electromagnetic nature of the infrared radiation. Such a statement may be ambiguous if it is specified that the experiment, far from being an isolated experiment [717] , insert it into an intensive research elettromagntisti of the late nineteenth century, which aims not only to check the conclusions of the theory of Maxwell but also to inspect the conditions of propagation of electromagnetic waves according to the different frequency bands. The verification of elettromagneticca nature of radiant heat that is not a result of this research, and certainly not the only, let alone the final. The experiment of 1922 was used primarily to fill the region of Hertzian waves and infrared waves, and finally get a continuous transition from light visible to electromagnetic waves. ...>> Taken from ELECTROMAGNETIC NATURE OF THE EXPERIMENT OF RADIANT HEAT 1922
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