The same arrangement can be supplied to a pair of coaxial cylinders.
Let a solid circular sectioned cylinder of radius R1 be enclosed in a coaxial tube of inner radius R2.
The other case of importance is that of two coaxial cylinders.
The probe looked like an aluminum pipe but was really a special tube built like a segment of coaxial cable.
coaxial 1904, as a term in mathematics; coaxial cable is 1934. See com- + axis.