. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. • 2 NIGHT OV£R ^ 2 l^uj VHOIC ATLANTIC So Z a. 0URir4Q VHiOHSiCNHlSs _ v3 J^ MC VERT V/miABlC •OP ^ TWJM Vt»Wl*R TO ~ VCRY &7R0N& . 3T0Rn3 HXVc K occioEO cr ANO HOOMLtCMT HAY AVC AN iririUENCC ' T ? i "i". QRItlMK«TlN( Fig. 8. Thus in the morning and the evening, when, in consequence of the difference in longitude, dayhght or darkness extends only part of the way across the ocean, the received signals are at their weakest.
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. • 2 NIGHT OV£R ^ 2 l^uj VHOIC ATLANTIC So Z a. 0URir4Q VHiOHSiCNHlSs _ v3 J^ MC VERT V/miABlC •OP ^ TWJM Vt»Wl*R TO ~ VCRY &7R0N& . 3T0Rn3 HXVc K occioEO cr ANO HOOMLtCMT HAY AVC AN iririUENCC ' T ? i "i". QRItlMK«TlN( Fig. 8. Thus in the morning and the evening, when, in consequence of the difference in longitude, dayhght or darkness extends only part of the way across the ocean, the received signals are at their weakest. It would almost appear as if electric waves, in passing from dark space to illuminated space and vice versa, were reflected and refracted in such a manner as to be diverted from the normal path. Later results, however, seem to indicate that it is unlikely that this difficulty would be experienced in telegraphing over equal dis- tances north and south on about the same meridian, as, in this case, the passage from daylight to darkness would occur more rapidly over the whole distance between the two stations. I have here some diagrams which have been carefully prepared by Mr. H. J. Round. These show the average daily variation of the signals received at Clifden from Glace Bay. The curves traced on the diagram (fig. 8) show the usual varia- tion in the strength of these transatlantic signals on two wave lengths —one of 7,000 meters and the other of 5,000 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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