Journal of the Academy of Natural Sciences of Philadelphia . mes of air with thesame intensity, and consequently the partition, exposed on its two faces to equalactions will have no curvature, or in other words, will be plane; but if the twoquantities of air are unequal, in which case the two films will pertain to spheresof different diameter, and will therefore press these two quantities of air unequally,the partition subjected on its two faces to unequal actions will acquire convexityon the side where the elasticity of the air is least, until the effort which it exerts,in virtue of its curva
Journal of the Academy of Natural Sciences of Philadelphia . mes of air with thesame intensity, and consequently the partition, exposed on its two faces to equalactions will have no curvature, or in other words, will be plane; but if the twoquantities of air are unequal, in which case the two films will pertain to spheresof different diameter, and will therefore press these two quantities of air unequally,the partition subjected on its two faces to unequal actions will acquire convexityon the side where the elasticity of the air is least, until the effort which it exerts,in virtue of its curvature on the side of its concave face, counterbalances the excessof elasticity of the air which is in contact with that face, which relation as we have seen is given by the formula r = > which gives the radius of the parti- p—p1 tion when we know those of the two films. In Fig. 28 the diameters of the two films are equal, and as a result the par-tition is a plane. In Figs. 29 and 30 they are in the ratio of 2 to 1 and 3 to 1, Fig. 28. Fig. 29. Fig. and as a result the partitions are curved and the radius of curvature can be de-termined from the formula given above. Thus when the surface is curved, theeffect of the surface-tension is to make the pressure on the concave side exceed the pressure on the convex side by T \- + —L where T is the intensity of the surface- (Ki ix2 tension and Rj and R2 are the radii of any two sections normal to the surface and 358 MORPHOLOGY OF THE CEREBRAL CONVOLUTIONS. Fig. 31.
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