Consider the three frames shown in Figure $3.$ The figure is a regular tetrahedron with

side lengths equal l $=1$m$.$ The base frame is centrally located under the top vertex

with the Ae$1$ perpendicular to the edge it is directed towards. The corner frame $\{$B$\}$

is located at the vertex with the Be$2$ directed along the edge $($and colinear with Ae$2$

and Be$1$ perpendicular to the planar face as shown at the rear of the tetrahedron, as

shown in Figure $3.$ Frame $\{$C$\}$ is located at the top vertex oriented symmetrically

around the edges. That is the direction