The London, Edinburgh and Dublin philosophical magazine and journal of science . to thedifferent heats, and passing a voltaic current through it, and notingthe electrical resistances of the wire cold and when heated. In orderto find the degrees of heat, I made a series of careful experimentswith the same wire for a large number of known resistances thus obtained I found did not agree accurately withthe formula given by Dr. Siemens. The formula that agrees correctlywith my results is This formula was arrived at theoretically by a consideration of theexpansion of the metal longi
The London, Edinburgh and Dublin philosophical magazine and journal of science . to thedifferent heats, and passing a voltaic current through it, and notingthe electrical resistances of the wire cold and when heated. In orderto find the degrees of heat, I made a series of careful experimentswith the same wire for a large number of known resistances thus obtained I found did not agree accurately withthe formula given by Dr. Siemens. The formula that agrees correctlywith my results is This formula was arrived at theoretically by a consideration of theexpansion of the metal longitudinally and in diameter, together witha probable value of the retardation of the current due to heat. Every precaution against error was adopted in the wire had a preliminary heating to a high temperature, and thevalue of any thermo-electric current taken into account. The results of the spectroscopic analysis of the flame I 2:)ropose tocommunicate in a future Number. * Communicated by the Author. t Practically 75 may b2 neglected. Tig. 3. Fial MoL^SAYolMFlL. Tx^. 4r.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
