Bauhaus-Universität Weimar

Sound and Music. A Non-Mathematical Treatise on the Physical Constitution of Musical Sounds and Harmony
Taylor, Sedley
only because we are accustomed to tbink of Sound as 
something with an external objective existence ; not 
as consisting merely in a state of motion of certain 
air-particles, and therefore liable, on the application 
of an opposite system of equal forces, to be absolutely 
A single tuning-fork presents an example of this 
very important phenomenon. Each prong sets up 
vibrations corresponding to a simple tone, and the 
two notes so produced are of the same pitch and 
intensity. If the fork, after being struck, is held 
between the finger and thumb, and made to re¬ 
volve slowly about its own axis, four positions of 
the fork with reference to the ear will be found 
where the tone completely goes out. These posi¬ 
tions are mid-way between the four in which the 
faces of the prongs are held flat before the ear. 
As the fork revolves from one of these positions 
of loud tone to that at right-angles to it, the 
sound gradually wanes, is extinguished in passing 
the Interference-position, reappears very feebly im¬ 
mediately afterwards, and then continues to gain 
strength until its quarter of a revolution has been 
7 6. The case of coexistent unisons has now been 
adequately examined : we proceed to enquire what 
happens when two simple tones differing slightly in


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