File:Volume-of-Sphere Post-1461.png

English: The volume of a sphere in terms of the radius of the sphere is ${\displaystyle {\frac {4}{3}}\pi r^{3}}$.

The upper slide rule in the image has been used to project the value of the constant ${\displaystyle {\frac {4}{3}}\pi =4.19}$ onto DF. The lower slide rule is set to project a radius ${\displaystyle r}$ from scale C to spherical volume (${\displaystyle {\frac {4}{3}}\pi r^{3}}$) onto K.

This was accomplished by setting the left index of the C scale opposite the value 4.19 on K - Effectively multiplying all values on K by ${\displaystyle {\frac {4}{3}}\pi }$.