. Procédure . émetteur ou station réceptrice, par exemple, par modification de la capacité de l'antenne en raison de la présence offog, etc. Mais la persistance avec laquelle elle s'est produite, Et le fait qu'aucune quantité de réglage à la station de réception remédieMatters altho simultanément d'autres stations ont reçu thiswave parfaitement, empêche l'acceptation d'une explication au motif de l'absorption atmosphérique, c'est-à-dire, une explanationas est employée pour effacer l'absorption de la lumière du jour à de longues distances. Il est clairement impossible qu'une onde de 3260 mètres préviouslyd'intensité satisfaisante peut être un
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. Proceedings . mitter or receiving station, as, for example, thru alteration of antenna capacity because of the presence offog, etc. But the persistency with which it occurred, and thefact that no amount of tuning at the receiving station remediedmatters altho simultaneously other stations were receiving thiswave perfectly, prevents the acceptance of an explanation on thegrounds of atmospheric absorption, that is, such an explanationas is employed to clear up the daylight absorption at long ranges. Clearly it is impossible that a wave of 3260 meters previouslyof satisfactory intensity can be absorbed completely at a distanceof 350 miles while at the same time a wave of 3100 meters re-mains of full strength. And there is not much to be said in favorof the assumption that alterations of the refractive power of low-hanging cloud banks or of layers of clouds produce a bendingof the wave trains which causes them to pass over the receivingstation, while at the same time waves of only 5 per cent, differ- 43. 44 ence in length are received as well, or even more strongly (as isfrequently observed). It is however possible, that under certain atmospheric condi-tions, which may be caused by clouds or masses of fog (whichare found with great regularity at certain seasons on the Pacificcoast), or by by partially ionized masses of air at greater heights, the energy of the upper part of the wave may be deflected orbent downward. Dr. Eccles at the Dundee meeting of the BritishAssociation pointed out that a bending of the wave as it travelledmight be produced if the upper layers of air were even partly con-ducting. The appearance of the bending wave front as it travelsfrom left to right is shown in Figure 8. Under such conditionsthere are acting at the receiving stations two trains of waveswhich have travelled over paths of unequal lengths or which havetravelled with unequal velocities. Consequently there will be aphase displacement between them and interference at certainlocalities.
