. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 272 SOME NEW M0DP:S OK r^TCllTlNG. iiiiiniicr by incaiis of a Wheatslone bridge, mado up of the (wo side ai'cs UuMusolves and two suitable resistances, which are wound as ek'ctroinaonels in such a manner as to operate tlie i-e<ruhit- inu" ni(M hanisiu. The central cylinder thus carries the cuiTent only when Ihe l)ridas. It is ])ossibl(>, as Tesla has shown, to excite such tubes to lumi- nosity by simply placing them
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 272 SOME NEW M0DP:S OK r^TCllTlNG. iiiiiniicr by incaiis of a Wheatslone bridge, mado up of the (wo side ai'cs UuMusolves and two suitable resistances, which are wound as ek'ctroinaonels in such a manner as to operate tlie i-e<ruhit- inu" ni(M hanisiu. The central cylinder thus carries the cuiTent only when Ihe l)ridas. It is ])ossibl(>, as Tesla has shown, to excite such tubes to lumi- nosity by simply placing them in a varying electrostatic field of high frequency. About 1(S92 Arons show^'d (hat mercury vapor traversed. KrMStancc Fid. :i. I)isi)iisiti()ii of mercury vapor pi-essure rises to about -2 mm. of li(|uid mei-cui-y, or about one fonr-huudi-edth of an atuu)sphere. Cooper-lb'wi(t lamps operate under a dilh'rence of [)oten(ial of 110 vohs, of which aboiU SO are absorbed in (he arc. Since (he iu(er- nal resistance is very high at first, this ])otential diil'erence is insuf- ficient to start the light, and several thousaiul volts are recjuired for a brief interval at the start. Accordingly some auxiliary device has to be providecl, as is the case with the Nernst lamp, to heat (he con- ductor to the tem])erature at which the ordinary voltage will nuiin- tain incandescence. For e\am[)le, the re(|uire(l voltage nuiy be ob-. 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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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
