Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 Excerpt: ...movement reaches either end. Here, as in the case of longitudinal displacements, stationary vibrations can only occur when the length of the string is some whole number of half wave lengths, or an even number of quarter wave lengths. Ifn= the number of segments into which a cord divides, the length of the cord is Laws of vibration of cords illustrated by the sonometer. 351. Vibrations of Plates.--Chladni's experiments. INTERFERENCE OF VIBRATIONS. 352. Two Equal Vibrations.--The general principle of interference is, that when a vibrating particle is actuated at the same time by two or more systems of vibrations, its actual motion will be the resultant of the motions due to each of the systems. In the case of two sounds of the same pitch traveling in the same direction, the motion of a given particle may be the sum of the motions due to the two sounds, or it may be their difference. In the former case the sound is increased. In the latter it is diminished, and may be completely destroyed. Interference produced by two tuning forks in unison. Interference of two organ pipes of the same pitch. Interference produced by dividing a wave and causing one-half to travel a greater distance than the other. Interference of the waves produced by a tuning fork; one from between and the other from outside the prongs. 353. Interference by Refletftion.--The interference of direct and reflected waves in producing stationary vibrations has already been treated. 354. Vibrations of Unequal Duration.--Meaning of the term p/zase. Beats. Explanation of beats. Beats are only produced by sounds not differing widely from unison. The number of beats per second is the difference between the numbers of vibrations of the two notes. Optical expression of beats. Superposition of sounds...
"synopsis" may belong to another edition of this title.
