very little indeed in the magnitude of the spiral angle öÝ, that is to say in the relative velocities of radial and tangential growth. It is upon the angle ö¡
that the difference in their form mainly depends:
very little indeed in the magnitude of the spiral angle öÝ, that is to say in the relative velocities of radial and tangential growth. It is upon the angle ö¡
that the difference in their form mainly depends: