ABSTRACT
MOUTH RESONANCE IN R ELA TIO N TO LARY NG EA L PITC H .
W e have seen, from th e experim ents w ith models, th a t th e cavities of the m outh (except in the case of high-pitched resonances) behave generally like H elm holtz resonators. One of the qualifications of such a resonator is th a t it shall be sm all com pared w ith th e w ave-length of the v ibrations which it produces.1 The inside of such a resonator is th en entirely filled w ith pa lp ita ting air which presses rhythm ically against all p a rts of the containing w a lls ; there can be no direction of sound against one p a r t or ano ther of th e in terior of such a resonator. A nd so it generally is, w ithout doubt, in the case of the hum an m outh. If the resonator is large (within the permissible lim its of size) larger amplitudes of v ibration m ay be set up th an if it is smaller, though the musical p itch of bo th resonators m ay be the sam e if their orifices are properly proportioned to the volum e of th e ir cavities.
