Sound

action aërial agitated atmosphere audible augmented beats bell burner carbonic acid caused centre column of air condensation corresponding density direction disk distance divides echoes effect elasticity embouchure experiments fog-signals fork fundamental tone gases glass hear heard heat Helmholtz illustrated inches instrument intensity interval John Herschel law of superposition layers length light liquid longitudinal major third membrane ment miles Montlhéry motion musical sound nodal lines nodes number of vibrations observed obtained octave organ-pipe orifice oscillation overtones particles pass pendulum pipe pitch placed plate 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 string surface temperature tion Trinity House tube tuning-fork tympanic membrane unison vein velocity of sound ventral segments vibrating segments Villejuif whistle wire