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Updated: June 14, 2025
Supposing, then, that we take a plate of a wedge form, which grows gradually thicker from edge to back, we ought to expect, in red light, a series of recurrent bands of light and darkness; the dark bands occurring at thicknesses which produce retardations of one, three, five, etc., half wave-lengths, while the bright bands occur between the dark ones.
Professor Langley's explorations of the terra incognita of immensely long wave-lengths where lie the unseen heat-emissions from the earth into space, led him to the discovery that these, contrary to the received opinion, are in good part transmissible by our atmosphere, although they are completely intercepted by glass.
He succeeds in showing that, agreeably to the law of Kirchhoff, the relation between the emitting and the absorbing power must be independent of the special properties of the body under observation, and he thus again meets with the laws of Planck and of Wien: unfortunately the calculation can only be made in the case of great wave-lengths, and grave difficulties exist.
The event was timed with the outburst of radio noise, not the impact of the falling object, which was a minute later. Soames struggled to imagine what that event could be. The inter-base radio babbled. Somebody discovered that the static had been on all wave-lengths at the same time. Voices argued about it. In the radar-dome Captain Moggs said indignantly: "This is monstrous!
In this way they hear nothing but the Poldhu news reports which they desire to receive, and are not troubled by messages from other stations within range. Secrecy is also attained by the use of tuning. It is possible that another station may discover the wave-length being used for a secret message and "listen in," but there are so many possible wave-lengths that this is difficult.
Thus it cannot be very clearly explained why, by heating a body, the radiation is displaced towards the side of the short wave-lengths, or, if you will, why a body becomes luminous from the moment its temperature has reached a sufficiently high degree.
The law now requires that amateur experimenters use only short wave-lengths in their sending, which will not interfere with messages from Government or commercial stations. It also provides for the licensing of amateurs who prove competent. The stations owned and operated by boys have already proved of great use.
Starting from the single assumption of transverse undulations, we first of all determine the wave-lengths, and find that on them all the phenomena of colour are dependent. The wavelengths may be determined in many independent ways. Newton virtually determined them when he measured the periods of his Fits: the length of a fit, in fact, is that of a quarter of an undulation.
Rowland himself, however, undertook to provide a remedy. Aided by Lewis E. Jewell, he redetermined, at the Johns Hopkins University, the wave-lengths of about 16,000 solar lines, photographing for comparison with them the spectra of all the known chemical elements except gallium, of which he could procure no specimen.
For him the abstract lived in the concrete, and the hidden motive of all he did was to bring what he called the daylight view of the world into ever greater evidence, that daylight view being this, that the whole universe in its different spans and wave-lengths, exclusions and envelopments, is everywhere alive and conscious.
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