Sound

aërial agitated atmosphere audible augmented beats bell burner carbonic acid caused centre column of air condensation corresponding density direction disk dissonance distance divides echoes effect elasticity Eustachian tube experiments fork fundamental tone gases glass hear heard heat Helmholtz inches instrument intensity interval John Herschel layers length light liquid longitudinal membrane ment miles minor third Montlhéry motion musical intervals musical sound nodal lines nodes number of vibrations observed obtained octave organ-pipe orifice overtones particles pass pendulum pipe pitch placed plate pressure produced Prof prongs puffs pulses rapidity rarefaction rates of vibration ratio reed reflected rendered resonance resultant tone rotation screen sensitive flame siren sonorous wave sound-wave South Foreland square stretched striking string surface temperature tion Trinity House tube tuning-fork tympanic membrane unison vein velocity of sound ventral segments vibrating segments Villejuif whistle wire