¶ Restraints (2)
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Index Entry
Restraints:
"to the six edges of the tetrahedron, negative and positive… They keep showing up in these models.
“You are trying to make a wire wheel. How many spokes does it take? You have to have three out this way and three out that way to keep the hub from shimmying. You have to take care of the rotation and the torque-- that way and this way-- we had six… multiply each of these by two… comes 12. You cannot have a wire wheel with less than 12 spokes.”
