. The London, Edinburgh and Dublin philosophical magazine and journal of science. ^;.IF: Jsij/is of liquid jExpaitfio/i 2, Mwi/itui Et/ur jM~Dmn- S. IrctocMjmArsaiw 3. Ana/tit-AU-uhU 10. Protobromi(U,tfPh<Jsp?wrust. Xrom/AcqfAinyU, //, Bromide of 3n<nu/(tofH(/iJxom]-boro (k / w Aft 30^ *y* 4 ^ ^ $ , #.t *JF ra- ?OOISOO / s/ / f 1 y A / Xootiso ./ —t£- y<ooil. ~0 V\^ 20- 30 W so / a. THELONDON, EDINBURGH, and DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [FOURTH SERIES.] MARCH 1868. XIX. On the Velocity of the Propagation of Waves in Ga
. The London, Edinburgh and Dublin philosophical magazine and journal of science. ^;.IF: Jsij/is of liquid jExpaitfio/i 2, Mwi/itui Et/ur jM~Dmn- S. IrctocMjmArsaiw 3. Ana/tit-AU-uhU 10. Protobromi(U,tfPh<Jsp?wrust. Xrom/AcqfAinyU, //, Bromide of 3n<nu/(tofH(/iJxom]-boro (k / w Aft 30^ *y* 4 ^ ^ $ , #.t *JF ra- ?OOISOO / s/ / f 1 y A / Xootiso ./ —t£- y<ooil. ~0 V\^ 20- 30 W so / a. THELONDON, EDINBURGH, and DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [FOURTH SERIES.] MARCH 1868. XIX. On the Velocity of the Propagation of Waves in GaseousMedia. By V. Regnault*. THE formulae which physicists have hitherto employed to re-present the rate of propagation of a wave in a gaseous mediumwhich is either unbounded in all directions, or enclosed in astraight cylindrical tube, assume the gas to be perfectly elastic,and the excess of the elastic force which gives rise to the propa-gation of the wave to be infinitely small in comparison with theelasticity of the medium at rest. These hypotheses, being introduced from the first into the cal-culation, necessarily produce their consequences in the resultingformulae; but as not one of the known gases exactly satisfiesthese conditions, we may expect to find sensible discrepanciesbetween the results of actual experiments and those deduced bycalculation from ^ In fact, when we assert that a gas is perfectly elastic,
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