Elements of natural philosophy (Volume 2-3) . computed and observed velocity explained. £-32° = 0,00208 [(i^^V-lU 199,\ 915,69/ • J Tliis is called the amount of heat given out by an elementof air during its condensation in a sound wave. It was tothe increased elasticity imparted to air by this suddenchange of a portion of its heat from latent to free, thatLaplace first attributed the great disparity between thecomputed and observed velocity of sound. Effect on thestratum CDresumed. Tvro cases mayarise; First case; AA § 27. Before proceeding further we must remark, thatnothing has been sai
Elements of natural philosophy (Volume 2-3) . computed and observed velocity explained. £-32° = 0,00208 [(i^^V-lU 199,\ 915,69/ • J Tliis is called the amount of heat given out by an elementof air during its condensation in a sound wave. It was tothe increased elasticity imparted to air by this suddenchange of a portion of its heat from latent to free, thatLaplace first attributed the great disparity between thecomputed and observed velocity of sound. Effect on thestratum CDresumed. Tvro cases mayarise; First case; AA § 27. Before proceeding further we must remark, thatnothing has been said of the conductof the stratum C D, after it was im-pelled forward from its place of rela-tive rest by the action of the stratumA B, which was brought by thedisturbing cause, say the motion ofa rigid plane, to the position A B. Two cases may occur: either the stratum A B may beretained in the position AB\ or the disturbing planemay, by an opposite movement, leave this stratum unsup-ported from behind. In the first case, if the medium bo. HB ELEMENTS OF ACOUSTICS. 35 homogeneous, the masses of all its particles will be equal, in first case aand the velocity impressed upon those in the stratum ^LnJitted inCD will, by the principle of the collision of elastic masses, the direction ofbe transferred undiminished to those in the stratum EF,the disturbruice;after which the stratum O D will come to rest; and thesame of the succeeding strata in front: Mechanics, § 247;so that there will simply be a pulse, transmitted along thedirection in which the primitive disturbance acted. Inthe second case, the stratum A B\ being left unsupported In the secondfrom behind, by reason of rarefaction, will be thrust back- pulse alsoward by the superior elasticity of the medium in front, transmitted wand this return or backward motion will take place in all direction>the strata in front, in the same order of time and distancefrom the original disturbance as in the instance of theforward movemen
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