. Carnegie Institution of Washington publication. SYNTHESIS OF VIBRATIONS. 133 to add another vibrating reed with magnet to the end of the first one (see "Elements of Experimental Phonetics," p. 70), but the additional weight on the end of the spring made the apparatus difficult to manage; a multiple pendulum was therefore tried. The multiple pendulum is shown in figure 119. The frame carries a projecting half circle with bearings for the knife edges of the longest pen- dulum. This pendulum is held bj' a screw in a metal block; the posi- tion of its point of support may be adjusted,
. Carnegie Institution of Washington publication. SYNTHESIS OF VIBRATIONS. 133 to add another vibrating reed with magnet to the end of the first one (see "Elements of Experimental Phonetics," p. 70), but the additional weight on the end of the spring made the apparatus difficult to manage; a multiple pendulum was therefore tried. The multiple pendulum is shown in figure 119. The frame carries a projecting half circle with bearings for the knife edges of the longest pen- dulum. This pendulum is held bj' a screw in a metal block; the posi- tion of its point of support may be adjusted, or it can be replaced by a shorter pendulum; in this way its period may be varied. It carries an adjustable half ring with bearings for the knife edges of the second pendulum. The second pendulum is held in a similar metal block with knife edges; it carries an adjustable bearing for the third pendulum, etc. In this way the vibrations of three pendulums may be compounded and the period of each may be varied at will. The pendulums are set in motion by a sharp blow from a felt hammer, or by a puff of air; these blows are repeated at inter- vals. The period of the blows and those of the pendulums can be varied at will. The sharp blows represent the glottal puffs and the various pendulums the vibratory- elements of the vocal cavity. Vari- ous degrees of friction are introduced by adding wind vanes to the pendulums. The principle is capable of extension to more than three pendulums. If the vowel vibrations are the results of puffs of various sharpness acting on a series of cavities, the analogy of this apparatus to the vocal vibrator}' system is verv close It must be possible to obtain curves that. Fig. 119.—Multiple Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. W
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