180 A, M. Mayer-~ Researches in Acoustics. 
8.) Kaperiments in which are produced from the above curves 
(sec. 6) the Motions of a Molecule of Air when it is animated 
with the resultant action of the six elementary vibrations form- 
ing a musical note; or is set in motion by the combined action 
of sonorous vibrations forming various musical intervals, 
We may imagine the curve corresponding to a musical note, 
represented in fig. 3, as formed by the trace of a vibrating 
molecule of air, or of a point of the tympanic membrane, on a 
surface which moves near these points. Therefore if we slide 
this curve along its axis, under a slit in a screen which allows 
only one point of the curve to appear at once, we shall repro- 
duce in this slit the vibratory motion of the aerial molecule and 
va 
of the point on the tympanic membrane. I have exhibited this 
motion in a continuous, or rather, recurring manner, as follows: 
On a piece of Bristol board I drew a circle, and in one quadrant 
of this circle I drew 500 equidistant radii. On these radil, as 
recurring, as shown in fig. 7. I now cut this curved figure ou 
