WALK-THRU OPENINGS                                                               


Walk thru openings are readily fabricated 
by using tetrahedronal framing around the edges.
Ideally, at least one of the edges of the tetrahedron
is geodesic with respect to the dome.
However, 
practical experience has shown this isn't necessary 
and other design criteria may take precedence
such as the purpose of the opening
and the availability of a given strut size.
See detail drawings of the walk-thru openings 
for a give frequency.

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